1、1 120(560)1UR A11 B11 C01 D1 2 2i A B C D 3BA=1232BC=3212ABC=()A30 B.45 C.60 D.120 4MI,N1,2,3,4,5()A815 B.18 C.115 D.130 5annnS*2120nnnaaanN16182024aaa35S A140 B280 C70 D420 6:aR221xay:|12xx A1 B2 C3 D4 72633.14Ssin150.2588 sin7.50.1305 A2.598 B3.106 C3.132 D3.142 3 (520)132()sinf xx_.14,12yx,15x,y5
2、0210210 xyxyxy,z=2x+y_ 16lnyxx1,1 221yaxax,a=(17-2112221070)17ABCABCabc.1A 22aABC.182005 x 1 2 3 4 5 y 10 15 19 23 28 1yx 2200080 ybxa 4 1221niiiniix ynxybxnx 191111ABCDABC DACBDO 11B C1A BD 2AB12,AA3BAD1AOABCD 11BA BD 200abFFx.1C 2FlC,A BABMMlxyNPFMNOPN1S2S1210SSl.21.14tfx 20t1xxg xe f xtexRt.22xOy:xtlyattx.A21:8 cos120CBOA.1B2C 2l2C,M Na.ABCD1A1B1C1DO
