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3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
人气:328 ℃ 时间:2020-10-01 09:01:10
解答
3(x+y)+2(x-y)=36
4(x+y)-5(x-y)=2
5x+y=36
-x+9y=2
解得
y=1,x=7
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