解方程1.{3x-4y=3 x+4y=17 2.{3x-y=7 4x+2y=16
解方程1.{3x-4y=3 x+4y=17 2.{3x-y=7 4x+2y=16
数学人气:351 ℃时间:2019-12-25 23:05:49
优质解答
1:3x-4y=3(1) x+4y=17(2) (1)+(2)得:4x=20x=5把=5代入(2)5+4y=17 4y=12 y=3 所以 2:3x-y=7(1) 4x+2y=16(2) (1)×2得:6x-2y=14(3) (3)+(2)得:10x=30 x=3 把x=3代入(1) 9-y=7 y=2 所以
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