解方程组一{2x-5y=1,5x+2y=17 二{x+y/2=6-x-y/3,4(x+y)-5(x-y)=2
1个回答
(2x-5y=1)乘以2
(5x+2y=17)乘以5
两式相加解出x=3,代入解出y=1
同理解第二个方程
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