1、 计算下面各题,怎样简便就怎样算。专训(一)(1)27.373.272.7 (2)5.851.750.25(3)15.0478.925.047 (4)12.63.287.45.72(5)7.83.52.26.5 (6)600(16076)7(7)704904 (8)84035 (9)382101382 (10)121.560.44专训(二)(11)426.783.22 (12)27534727(13)251258 (14)(10588)(2573)(15)18019(10674)60 (16) 40.65(7.3816.85) (17)87475387 (18)73.72(36.283.72)
2、-(19)780(128113)45 (20)210145专训(三)(21)836.21.7 (22)(1254)8 (23)73.26(18.93.26) (24)1019.9 (25)832(241225)4 (26)453773451045(27)51278.661.34 (28)1069918(29)1500254 (30)207.22.8 专训(四)(31)759975 (32)2532125(33)876497224403 (34)8.75(4.752.36)(35)25(104893) (36)12525(84)(37)654386365.465.4 (38)1400258专训(
3、一)答案(1)27.373.272.7 (2)5.851.750.2527.372.773.2 =5.85-(1.75+0.25)10073.2 =5.85-2173.2 =3.85(3)15.0478.925.04715.0475.0478.92108.9218.92(4)12.63.287.45.72(12.67.4)(3.285.72)20911(5) 7.83.52.26.57.82.2(3.56.5)10100(6)600(16076)760084750(7)704904 (8)84035(7090)4 840751604 1205640 24(9)382101382 (10)121
4、.560.44382(1011) 12(1.560.44)382100 12238200 10专训(二)答案11)426.783.2242(6.783.22)421032(12)2753472727(5347)2700(13)25125825(1258)25100025000(14)(10588)(2573)17981666(15)60 (16)16.42 (17)8700 (18)33.72 (19)2340 (20)3专训(三)答案(21)8.36.21.78.31.76.2106.216.2(22)(1254)81258481032(23)73.26(18.93.26)73.263.26
5、18.97018.951.1(24)1019.9(1001)9.91009.99.99909.9999.9(25)832(241225)48321648326413(26)45377345104545(377310)451004500(27)51.278.661.34 (28)106991842.611.34 95472843.95 1682(29)1500254 (30)207.22.8604 20(7.22.8)240 10专训(四)答案(31)759975 (32)253212575(991) 254(8125)7500 1001000 100000(33)876497224403876224(497403)11009002000(34)8.75(4.752.36)8.754.752.3642.361.64(35)25(104893) (36)12525(84)2512 1258(254)2543 1000100300 100000(37)65.4386365.465.465.4(38631)65.41006540(38)14002581400(258)14002007