2x-3y=7 2x+3y=1 解方程组
人气：201 ℃ 时间：2020-04-09 09:03:32
解答
(1)+(2)得
4x=8
∴x=2
把x=2代入(1)得
4-3y=7
∴y=-1
∴方程组的解是
x=2
y=-1
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