已知| x+y-10| +(2x-y-15)^2=0,求x-5y+3的值
人气:100 ℃ 时间:2020-06-27 09:26:51
解答
因为平方大于等于零,绝对值也大于等于零,所以
| x+y-10| =0
(2x-y-15)^2=0
所以x+y-10=0
2x-y-15=0
x=25/3,y=5/3
所以代入,求得x-5y+3=3
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