丨x-1丨+(y+3)²=0求1-xy=xy²的值
丨x-1丨+(y+3)²=0求1-xy=xy²的值
人气:227 ℃ 时间:2019-08-22 13:05:19
解答
丨x-1丨+(y+3)²=0
x-1=0,y+3=0
x=1,y=-3
1-xy+xy²=1-1*(-3)+1*9=1+3+9=13
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