> 其他 >
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x²y²+xy³=
人气:198 ℃ 时间:2019-08-21 00:59:42
解答
x²-2xy+y²
=(x-y)²
=2²
=4
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²
=3*(-1)²
=3
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版