已知二元一次方程组2x+y=5,x+2y=4,则x-y=?x+y=?
人气:226 ℃ 时间:2020-05-24 23:26:07
解答
∵2x+y=5……①
x+2y=4……②
∴①式—②式得
x-y=1
∴①+②得
3(x+y)=9
∴x+y=3
因此x-y=1 x+y=3
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