已知|x-2y|+|5x-7y-2|则,x = y=
问题描述:
已知|x-2y|+|5x-7y-2|则,x = y=
答
(保证对)
x-2y=0
5x-7y-2=0
x-2y=0
5x-7y=2
5x-10y=0
5x-7y-5x+10y=2
3y=2
y=2/3
x=4/3
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