二元一次方程组计算题 (1 )5253yxyx (2 ) 523xyxy (3 )152yxyx (4 )1302yxyx (5 )14329mnnm (6 )qpqp451 332 () (7 )924523nmnm (8 )524753yxyx (9 )7441 156yxyx (1 0 )5341 291 1yxyx (1 1 )2.03.05.0523151yxyx (1 2 )ayxayx343525( 其中a 为常数) (1 3 )6430524mnnm (1 4 )323113121yxyx (1 5 )11 01 17.03.04.0yxyx (1 6 )722013152yxyx (1 7 )cyxcyx72 9631 12(c 为常数) (1 8 )cdyxdcyx23434(dc、为常数) (19)82302yxyx (20)33352yxyx (21)52243yxyx (22)543cbcaba (23)24352yxyx(用代入法) (24)12392yxyx (25)632223yxyx (26)15315)1(3xyyx (27)1 12353232zyxzyxyx (28)35641 5xzxz ①② (29)2231 4mnmn ① ② (30)4 (1)3(1)2223xyyxy (31))2(3 0 034)1(1 5 02yxyx (32))2(574)1(973yxyx (33))2(4 265)1(1 043yxyx (34)1 323334mnmn (3 5 )3520xyxy, (3 6 )23521xyxy, (3 7 )4519323mnmn ,; (3 8 ) 1 6530xyyx (3 9 ) 32123xyxy (4 0 ) 6721(1)251(2)xyxyxyxy (41 )245xyxy (42 )35(1)522 3 (2 )xyxy (4 3 )231 4326xyxy, (4 4 )32421257 .yxyxxy, (4 5 )22311 332513 0 .9xyxy (4 6 )23328xyxy (47) (48) (49)8372yxxy (50) %1 21 2 0%1 1%1 41 2 0yxyx 23236732yxyx