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六年级解方程专项练习200题(含答案).doc

1、 六年级解方程专项练习200题(有答案)(1)x=, (2) x=, (3) 4x=,(4) 82.52x=13.6 (5) 0.78:x=3:5, (6)120%x=0.4,(7)16+6x=40 (8) 1(x)=6,(9)2xx=1.2, (10)931.7x=13.4, (11)x25%x=24, (12)x+0.2=,(13)0.6x+90%x=78, (14)20%x2.43=0.8, (15)xx=42, (16)0.6x+32.5=67.5, (17)1(x0.45)=5,(18)x2.25=8.25, (19):x=3:12, (20)x+0.8=5.6, (21) 1.4:

2、x=1:0.75, (22) x(2)=24, (23) 4x=3,(24)12x+70.3=20.1, (25)x+x=, (26)x:42=, (27)0.5+x=, (28)0.8:=0.48:x, (29)=, (30)42:=:(31)5x0.4=75%,( 32) 6x0.9=4.5, (33)2(x3)=5.8,(34) 1.6x=6.4,(35) 4x39=29, (36)16+8x=40,(37) x1.1=3,(38)+2x=,(39)37x=1.04, (40)x1x=2, (41)xx=14,(42)3xx=,(43)=, (44)1.2:=,(45)=:,(46):=

3、x:0.8,(47)x=+1,(48)125%X+25%x=+25%x,(49)=, (50)X=,(51) 5:8=x:32, (52)2x+30.9=24.9, (53)5.3x2.9x=,(54)(72.8x)=1.5,(55)x:0.3=:,(56)150%x+66=99 (57)x+60.8x=16 (58) (59) (60)3(X)=1.3(61)(X+0.5):2=(X4):,(62) X0.05=3.528,(63)2X46=80, (64)44.53X=6.38,(65)4X7.2=10,(66)11.5X+X=20, (67)3.812+15X=87.6, (68)6X+

4、5=17, (69)0.6(2.5+X)=4.2,(70):=X:,(71),(72)(73) (74)4(+x)=,(75)0.25+x=, (76)x, (77)200:6=x:, (78)4X=,(79)8(x2)=2(x+7),(80):18%=, (81)2x=, (82)x+x=46, (83):x=:, (84)=, (85)5(3x4)2(x1)=5(2x1) (86)=, (87)8(2X7)=5(X+13),(88)3(x+4.5)=60, (89)1.6x+2.4=7.52, (90)3(x0.8)=6.3, (91)28.45x=5.8, (92)x:= (93)+2x

5、=,(94)x=15%,(95)xx=,(96)x+50%x=6, (97):x=0.3:12, (98)4x+2(8x)=26, (99)x=0,(100)+x=1,(101)x(+)=,(102),(103), (104)x,(105)x,(106)5x+35=650, (107)7203x=80,(108)3.6x0.9x=8.1, (109)44.53x=6,(110)=, (111)631.8X=7.2, (112)x=, (113)x=42, (114)x+=,(115)7x3=8.19, (116)12:0.6=x:,(117)3(x+2)=4(x+1),(118)3x70%x=

6、9.2, (119) 6+x=240,(120)22.50.4x=12.5, (121)x:3.5=4:2, (122)x0.8x6=16, (123):=x:8,(124),(125)x:15=:,(126)x+x=,(127)x50%x=5, (128)1x=, (129)2.5+1x=3, (130)3x2=4,(131)8.53x=2, (132)3x=4,(133)x5%=17.54,(134):=:(4x), (135) 6x+31=49, (136) 7x3=8.19,(137) 32.89x=17.5, (138) x0.36x=16,(139) 67+3x=69, (140)

7、 6x+2x56=0,(141) 3x0.454=2.7,(142) (142) 5.8x4.6x=0.96, (143) 8.4(9x)=3, (144) 3x1.2=8, (145)5x+28=71, (146)8.71.2x=3.9,(147)8x2.6x=37.8, (148)0.75x0.954=8.5,(149)542+3x=72,(150)8x2.6=37.8,(151)x=,(152)x+30%x=26, (153) 7.83x=3.6, (154) 631.8x=7.2, (155)10:x=4.5:0.8, (156):=x:, (157)X7.65=4.64,(158)2

8、8.25X=8.25, (159)X(3.6+2.97)=12.42, (160)x=, (161)14.5=5.5,(162)x80%x=48, (163)75%x5=6, (164)x6.8=15.4, (165)1.9x=5.7,(166)4.3yy=4.6, (167)5x+2.6=7.6,(168) x1.5=12.9, (169) 9x+5x=8.4, (170) 6.8+3.2x=14.8,(171)5x=, (172)x=,(173)4.53x=1.5, (174)(1+25%)x=0.5,(175)x40%x=9, (176)x20%=15.2,(178)xx=, (179)

9、x75%=3,(180)4x, (181):x=:4.5, (182)(x4.5)6=12.5, (183)2717x=13.4,(184)9.6+3x=3.245,(185)2x+5=5x7, (186) 3(x2)=25(x2), (187)4x3(20x)+4=0, (188)=1,(189)4x56=12, (190)8x3x=15.6, (191)30(x4)=60,(192)7.20.53x=1.2, (193)5x2.45=8,(194)+x=2,(195)5x+2.415=66, (196)3.2x+2.8x-x=1, (197)2.516-8x=12, (198)9.6-3x

10、=6.3, (199)5(x+6)=75,(200)x0.7+0.93=4, 解方程专项练习200题答案:(1)x=, =, , x=; (2) x=, x=, x21=21, x=12; (3) 4x=,4x+4x=+4x,=+4x, 4=4x4, x=(4) 82.52x=13.6 202x=13.6, 13.6+2X=20, 2X=6.4, x=3.2;(5) 0.78:x=3:5, 3x=0.785, 3x=3.9, x=1.3(6)120%x=0.4, 120%x+20%x=0.4+20%x, 0.4+20%x=1,0.4+20%x0.4=10.4, 20%x=0.6, 20%x=0

11、.6, x=3;(7)16+6x=40,16+6x16=4016, 6x=24, 6x6=246, x=4;(8) 1(x)=6,1(x)(x)=6(x), 1=6(x), 6x6=1, 6x3=1, 6x=4, 6x6=46, x=(9)2xx=1.2, x(2)=1.2, x=1.2, x=1.2, x=1;(10)931.7x=13.4, 271.7x=13.4, 271.7x+1.7x=13.4+1.7x, 13.4+1.7x=27,13.4+1.7x13.4=2713.4, 1.7x=13.6, 1.7x1.7=13.61.7, x=8(11)x25%x=24, 75%x=24, 7

12、5%x75%=2475%, x=32;(12)x+0.2=,x0.6=,x0.6+0.6=+0.6,x=,x=, x=1(13)0.6x+90%x=78, 1.5x=78, 1.5x1.5=781.5, x=52; (14)20%x2.43=0.8, 20%x7.2=0.8, 20%x7.2+7.2=0.8+7.2, 20%x20%=820%, x=40;(15)xx=42, x=42, x=42, x=252(16)0.6x+32.5=67.5, 0.6x+7.5=67.5, 0.6x+7.57.5=67.57.5, 0.6x=60, 0.6x0.6=600.6, x=100; (17)1(

13、x0.45)=5,(x0.45)(x0.45)=(x0.45), x2.4=1.6,x2.4+2.4=1.6+2.4, x=4,x=4, x=(18)x2.25=8.25, x2.25+2.25=8.25+2.25, x=10.5;(19):x=3:12, 3x=12, 3x3=93, x=3(20)x+0.8=5.6, x+0.80.8=5.60.8, x=4.8, x=4.8, x=8(21) 1.4:x=1:0.75, x=1.40.75, x=1.05 (22) x(2)=24, x=24, x=24, x=20;(23) 4x=3,4x+=3+, 4x=4, 4x4=44, x=1(

14、24)12x+70.3=20.1, 12x+2.1=20.1, 12x+2.12.1=20.12.1, 12x12=1812, x=1.5;(25)x+x=, x=, x, x=;(26)x:42=, 10x=42, 10x10=3010, x=3(27)0.5+x=, 0.75+x=3.75, 0.75+x0.75=3.750.75, x=3, x=3, x=6;(28)0.8:=0.48:x, 0.8x=0.48, 0.8x=0.2, 0.8x0.8=0.20.8, x=(29)=, x=, x=, x=3;(30)42:=:x=42,x=30, x=50;(31)5x0.4=75%, 5

15、x0.4+0.4=75%+0.4, 5x5=1.155, x=0.23( 32) 6x0.9=4.5, 6x0.9+0.9=4.5+0.9, 6x=5.4, 6x6=5.46, x=0.9;(33)2(x3)=5.8,2(x3)2=5.82 x3=2.9, x3+3=2.9+3, x=5.9;(34) 1.6x=6.4,1.6x1.6=6.41.6, x=4;(35) 4x39=29, 4x27=29, 4x27+27=29+27, 4x=56, 4x4=564, x=14;(36)16+8x=40,16+8x16=4016, 8x=24, 8x8=248, x=3;(37) x1.1=3,x

16、1.11.1=31.1, x=3.3(38)+2x=,+2x=, 2x=, 2x2=2, x=;(39)37x=1.04, 2.167x=1.04, 2.167x1.04=1.041.04, 1.127x=0, 7x7=1.127, x=0.16;(40)x1x=2, x1=2, x1+1=2+1, x=3, x=3, x=18;(41)xx=14,x=14,x=14, x=18;(42)3xx=,x=,x=, x=;(43)=, 2.4x=720.26, 2.4x=18.72,2.4x2.4=18.722.4, x=7.8;(44)1.2:=,x=1.25,x=6,x=6, x=9;(45)

17、=:,x=18,x=,x=, x=12;(46):=x:0.8,x=0.8,x=0.04, x=0.2;(47)x=+1, x=, x=1(48) 125%X+25%x=+25%x,0.25x+0.250.25=10.25, 0.25x=0.75, x=3;(49)=, 0.25x=1.251.6,0.25x0.25=1.251.60.25, x=8;(50)X=,X=, x=;(51) 5:8=x:32, 8x=532,8x8=5328, x=20(52)2x+30.9=24.9, 2x+2.7=24.9, 2x+2.72.7=24.92.7, 2x2=22.22, x=11.1;(53)5

18、.3x2.9x=, 2.4x=, 2.4x2.4=2.4, x=;(54)(72.8x)=1.5,(72.8x)=1.5, 72.8x=2.1, 72.8x+2.8x=2.1+2.8x, 72.1=2.1+2.8x2.1, 4.92.8=2.8x2.8, x=1.75;(55)x:0.3=:,x=0.3,x=, x=(56)150%x+66=99 1.5x+66=99 1.5x=33 x=22(57)x+60.8x=16 0.2x+6=16 0.2x=10 x=50(58) x=14.4(59) 0.55x=5.5 x=10(60)3(X)=1.33(X)(x)=1.3(x), 3=1.3x0

19、.78, 3+0.78=1.3x0.78+0.78, 4.68=1.3x, 4.681.3=1.3x1.3, x=3.6;(61)(X+0.5):2=(X4):,(x4)=(x+0.5),x4=x+0.5,x10x=x+x, 2.25x10+10=0.125+10, 2.25x2.25=10.1252.25, x=4.5(62) X0.05=3.528,X0.050.05=3.5280.05, X=0.1764;(63)2X46=80, 2X24=80, 2X24+24=80+24, 2X=104, 2X2=1042, X=52;(64)44.53X=6.38, 183X=6.38, 183X

20、+3X=6.38+3X, 6.38+3X=18,6.38+3X6.38=186.38, 3X=11.62, 3X3=11.623, X=;(65)4X7.2=10,4X7.2+7.2=10+7.2, 4X=17.2, 4X4=17.24, X=4.3;(66)11.5X+X=20, 12.5X=20,12.5X12.5=2012.5, X=1.6;(67)3.812+15X=87.6, 45.6+15X=87.6,45.6+15X45.6=87.645.6, 15X=42, 15X15=4215, X=2.8(68)6X+5=17, 6x+55=175, 6x6=126, x=2;(69)0.

21、6(2.5+X)=4.2,0.6(2.5+X)0.6=4.20.6, 2.5+x=7, 2.5+x2.5=72.5, x=4.5;(70):=X:, x=, x=, x=0.6(71), , ;(72),;(73), , (74)4(+x)=,+4x=,+4x=, 4x=4, x=1;(75)0.25+x=, 0.2+x=, 0.2+x0.2=0.2, x=, x=(76)x, , , x=;(77)200:6=x:, 6x=200, 6x6=4806, x=80(78)4X=, 4XX=X, X=4, X=4, X=10;(79)8(x2)=2(x+7), 8X16=2X+14, 6X16=

22、14, 6X=30, X=5;(80):18%=, X=0.186.5, X=1.17, X=7.8(81)2x=, 2x+2x=+2x, +2x=, +2x=, 2x=, 2x2=2, x=;(82)x+x=46, x(+)=46, x=46, x=46, x=40;(83):x=:, x=, x=, x=, x=;(84)=, 1.6x=6.42, 1.6x=12.8,1.6x1.6=12.81.6, x=8(85)5(3x4)2(x1)=5(2x1) 15x202x+2=10x5, 13x18=10x5, 13x1810x=10x510x, 3x18=5, 3x18+18=5+18, 3

23、x=13, 3x3=133, x=;(86)=, 3(6x1)=64, 18x3=64, 18x3+3=64+3, 18x=67, 18x18=6718, x=(87)8(2X7)=5(X+13), 16x56=5x+65, 16x565x=5x+655x, 11x56=65, 11x56+56=65+56, 11x=121, 11x11=12111, x=11,(88)3(x+4.5)=60, 3(x+4.5)3=603, x+4.5=20, x+4.54.5=204.5, x=15.5(89)1.6x+2.4=7.52, 1.6x+2.42.4=7.522.4, 1.6x=5.12, 1.

24、6x1.6=5.121.6, x=3.2;(90)3(x0.8)=6.3, 3x2.4=6.3, 3x2.4+2.4=6.3+2.4, 3x=8.7, 3x3=8.73, x=2.9;(91)28.45x=5.8, 28.45x+5x=5.8+5x, 5.8+5x=28.4, 5.8+5x5.8=28.45.8, 5x=22.6, 5x5=22.65, x=4.52(92)x:= 25x=3, 25x=, 25x25=, x=;(93)+2x=,+2x=, 2x=0, x=0;(94)x=15%,xx=15%x, 0.15x=0.15,0.15x0.15=0.150.15, x=1;(95)x

25、x=,x=,x=, x=(96)x+50%x=6, 1.5x=6, 1.5x1.5=61.5, x=4;(97):x=0.3:12, 0.3x=, 0.3x0.3=90.3, x=30;(98)4x+2(8x)=26, 4x+162x=26, 2x+16=26, 2x+1616=2616, 2x2=102, x=5(99)x=0,x+=0+,x=,x3=3, x=;(100)+x=1,+x=1,x=,x=, x=1;(101)x(+)=,x=,x=, x=(102), 3x3=, x=;(103), , x=20;(104)x, x=;(105)x,x, x=(106)5x+35=650, 5

26、x+3535=65035, 5x=615, 5x5=6155, x=123;(107)7203x=80, 7203x3x=803x, 240x=720, 240x240=720240, x=3;(108)3.6x0.9x=8.1, (3.60.9)x=8.1, 2.7x=8.1, 2.7x2.7=8.12.7, x=3;(109)44.53x=6, 183x=6, 183x+3x=6+3x, 6+3x=18, 6+3x6=186, 3x=12, 3x3=123, x=4(110)=, 2.5x=100.8, 2.5x2.5=82.5, x=3.2;(111)631.8X=7.2, 181.8X

27、=7.2, 181.8X+1.8X=7.2+1.8X, 7.2+1.8X=18, 7.2+1.8X7.2=187.2, 1.8X=10.8, 1.8X1.8=10.81.8, X=6(112)x=, x=, x=;(113)x=42, x=42, x=9;(114)x+=,x+=, x=, x=, x=(115)7x3=8.19, 7x33=8.193, 7x=24.57, 7x7=24.577, x=3.51;(116)12:0.6=x:, 0.6x=12, 0.6x=6, 0.6x0.6=60.6, x=10;(117)3(x+2)=4(x+1), 3x+6=4x+4, 3x+63x=4x

28、+43x, x+4=6, x+44=64, x=2(118)3x70%x=9.2, 3x0.7x=9.2, 2.3x=9.2, 2.3x2.3=9.22.3, x=4;(119) 6+x=240,6+x6=2406, x=234,x=234, x=390(120)22.50.4x=12.5, 22.50.4x+0.4x=12.5+0.4x, 12.5+0.4x=22.5, 12.5+0.4x12.5=22.512.5, 0.4x0.4=100.4, x=25;(121)x:3.5=4:2, 2x=3.54, 2x2=142, x=6(122)x0.8x6=16, 0.2x6=16, 0.2x6

29、+6=16+6, 0.2x0.2=220.2, x=110;(123):=x:8,x=8,x=8, x=4;(124), 0.06x=20.015, 0.06x0.06=0.030.06, x=0.5;(125)x:15=:,x=15,x6=156, x=40;(126)x+x=,x=,x=, x=;(127)x50%x=5, x=5, x6=56, x=30;(128)1x=, 1x+x=+x, +x=1, +x=1, x=, x=;(129)2.5+1x=3, 2.5+1x2.5=32.5, x=, x=, x=(130)3x2=4, 3x2+2=4+2, 3x=6, 3x3=63, x=

30、;(131)8.53x=2, 8.53x+3x=2+3x, 3x+2=8.5, 3x+22=8.52, 3x=6, 3x3=63, x=2;(132)3x=4, 3xx=4x, 4x=3, 4x4=34, x=(133)x5%=17.54,解:x5%+5%=17.54+5%,x=17.59, x=23;(134):=:(4x), 解:4x=, 2x+x=x, 2+x, =x, x=3(135) 6x+31=49, 6x+3131=4931, 6x=18, 6x6=186, x=3;(136) 7x3=8.19,7x33=8.193, 7x=24.57, 7x7=24.577, x=3.51;(

31、137) 32.89x=17.5, 32.89x+9x=17.5+9x, 17.5+9x=32.8,17.5+9x17.5=32.817.5, 9x=15.3, 9x9=15.39, x=1.7;(138) x0.36x=16,(10.36)x=16, 0.64x=16,0.64x0.64=160.64, x=25;(139) 67+3x=69, 42+3x=69, 42+3x42=6942, 3x=27, 3x3=273, x=9;(140) 6x+2x56=0,(6+2)x56+56=0+56, 8x=56, 8x8=568, x=7(141) 3x0.454=2.7, 3x1.8=2.7

32、, 3x1.8+1.8=2.7+1.8, 3x=4.5, 3x3=4.53, x=1.5;(142) 5.8x4.6x=0.96, 1.2x=0.96, 1.2x1.2=0.961.2, x=0.8;(143) 8.4(9x)=3, 9x=8.43, 9x=2.8, x=92.8, x=6.2;(144) 3x1.2=8, 3x1.21.2=81.2, 3x=9.6, 3x3=9.63, x=3.2(145)5x+28=71, 5x+2828=7128, 5x=43, 5x5=435, x=8.6;(146)8.71.2x=3.9,8.71.2x+1.2x3.9=3.9+1.2x3.9, 4.

33、8=1.2x, 1.2x=4.8, 1.2x1.2=4.81.2, x=4;(147)8x2.6x=37.8, 5.4x=37.8, 5.4x5.4=37.85.4, x=7;(148)0.75x0.954=8.5, 0.75x3.8=8.5, 0.75x3.8+3.8=8.5+3.8, 0.75x=12.3, 0.75x0.75=12.30.75, x=16.4,;(149)542+3x=72, 27+3x=72, 27+3x27=7227, 3x=45, 3x3=453, x=15;(150)8x2.6=37.8, 8x2.6+2.6=37.8+2.6, 8x=40.4, 8x8=40.4

34、8, x=5.05(151)x=,x=,x=,x4=4, x=;(152)x+30%x=26, (1+30%)x=26, 1.3x=26, 1.3x1.3=261.3, x=20;(153) 7.83x=3.6, 7.83x+3x=3.6+3x, 3.6+3x=7.8, 3.6+3x3.6=7.83.6, 3x=4.2, 3x3=4.23, x=1.4(154) 631.8x=7.2, 181.8x=7.2, 181.8x+1.8x=7.2+1.8x, 18=7.2+1.8x, 187.2=7.2+1.8x7.2, 10.8=1.8x, 10.81.8=1.8x1.8, x=6;(155)10

35、:x=4.5:0.8, 4.5x=100.8, 4.5x=8, 4.5x4.5=84.5, x=;(156):=x:, x=, x=, x=, x=(157)X7.65=4.64,X7.65+8.67=4.64+7.65, X=12.29;(158)28.25X=8.25, 28.25X+X=8.25+X, X+8.25=28.25, X+8.258.25=28.258.25, X=20;(159)X(3.6+2.97)=12.42, X6.57=12.42, X6.57+6.57=12.42+6.57, X=18.99(160)x=, xx=x, x=,x=, x=, x=;(161)14.

36、5=5.5,14.5+14.5=5.5+14.5, =20, 8=208, x=160(162)x80%x=48, (10.8)x=48, 0.2x=48, 0.2x0.2=480.2, x=240;(163)75%x5=6, 0.75x3=6, 0.75x3+3=6+3, 0.75x=9, 0.75x0.75=90.75, x=12(164)x6.8=15.4, x6.8+6.8=15.4+6.8, x=22.2;(165)1.9x=5.7,1.9x1.9=5.71.9, x=3;(166)4.3yy=4.6, 3.3y=4.6, 3.3y3.3=4.63.3, y=;(167)5x+2.6

37、=7.6, 5x+2.62.6=7.62.6, 5x=5, 5x5=55, x=1(168) x1.5=12.9, x1.5+1.5=12.91.5, x=11.4;(169) 9x+5x=8.4, 14x=8.4, 14x14=8.414, x=0.6;(170) 6.8+3.2x=14.8,6.86.8+3.2x=14.86.8, 3.2x=8, 3.2x3.2=83.2, x=2.5(171)5x=, 5xx=x, 5=x, 5=x, x=;(172)x=,x+x=+x, =+x,=+x, =x,=x, x=1;(173)4.53x=1.5, 1.53.5x=1.5, 1.53.5x+3

38、.5x=1.5+3.5x, 1.5=1.5+3.5x, 1.51.5=1.5+3.5x1.5, 0=3.5x, 03.5=3.5x3.5, x=0(174)(1+25%)x=0.5, 1.25x=0.5, 1.25x1.25=0.51.25, x=0.4;(175)x40%x=9, 0.6x=9, 0.6x0.6=90.6, x=15;(176)x20%=15.2,x20%20%=15.220%, x=76(177)30x30=180, 30x30+30=180+30, 30x=210, 30x30=21030, x=7;(178)xx=, x=, x=, x=;(179)x75%=3,x75

39、%75%=375%, x=, x=, x=(180)4x, 4x6=2.4, 4x=2.4+6, x=8.44, x=2.1(181):x=:4.5, x=4.5, x=2, x=2, x=5(182)(x4.5)6=12.5, 6x4.56=12.5, 6x27=12.5, 6x27+27=12.5+27, 6x=39.5, 6x6=39.56, x=6;(183)2717x=13.4, 2717x+17x=13.4+17x, 13.4+17x=27,13.4+17x13.4=2713.4, 17x=13.6, 17x17=13.617, x=0.8;(184)9.6+3x=3.245, 9

40、.6+3x9.6=16.29.6, 3x=6.6, 3x3=6.63, x=2.2(185)2x+5=5x7, 2x+52x=5x72x, 3x7=5, 3x7+7=5+7, 3x=12, 3x3=123, x=4;(186) 3(x2)=25(x2), 3x6=125x, 3x6+5x=125x+5x, 8x6=12, 8x6+6=12+6, 8x=18, 8x8=188, x=2.25;(187)4x3(20x)+4=0, 7x56=0, 7x56+56=0+56, 7x=56, 7x7=567, x=8;(188)=1,()24=124, 6(y+2)4(2y3)=24, 302y=24

41、, 302y+2y=24+2y, 2y+24=30, 2y+2424=3024, 2y=6, 2y2=62, y=3(189)4x56=12, 4x30=12, 4x30+30=12+30, 4x=42, 4x4=424, x=10.5;(190)8x3x=15.6, 5x=15.6, 5x5=15.65, x=3.12;(191)30(x4)=60, 30(x4)30=6030, x4=2, x44=24, x=8;(192)7.20.53x=1.2, 3.63x=1.2, 3.63x+3x=1.2+3x, 3x+1.2=3.6, 3x+1.21.2=3.61.2, 3x=2.4, 3x3=

42、2.43, x=0.8(193)5x2.45=8, 5x12+12=8+12, 5x=20, 5x5=205, x=4,(194)+x=2,x=,x=, x=(195)5x+2.415=66, 5x+36=66, 5x+36-36=66-36,5x=30,5x5=305,x=6;(196)3.2x+2.8x-x=1, 5x=1, 5x5=15, x=0.2;(197)2.516-8x=12, 40-8x=12, 40-8x+8x=12+8x, 8x+12=40, 8x+12-12=40-12, 8x=28, 8x8=288, x=3.5(198)9.6-3x=6.3, 9.6-3x+3x=6.3+3x, 6.3+3x=9.6,6.3+3x-6.3=9.6-6.3, 3x=3.3, 3x3=3.33, x=1.1;(199)5(x+6)=75,5x+30=75,5x+30-30=75-30,5x=45,5x5=455,x=9;(200)x0.7+0.93=4,x0.7+2.7=4,x0.7+2.7-2.7=4-2.7,x0.7=1.3,x0.70.7=1.30.7,x=0.91

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