若x-y=5.xy=6,x^2y+xy^2等于多少
11点之前有奖赏
人气：177 ℃ 时间：2020-05-17 12:43:39
解答
(x+y)²
=x²+2xy+y²
=(x²-2xy+y²)+4xy
=(x-y)²+4xy
=49
所以x+y=±7
x²y+xy²
=xy(x+y)
=±42
推荐
- 若x-y=5,xy=6,则x^2y-xy^2=_,x^2+xy^2=__
- 若x-y=5,xy=6,求x^2-xy^2和x^2y+xy^2
- 已知x-y=6,xy=-2,求3（xy+x-2y）-5(y-2x)+2(xy-x)的值.
- x-y=5,xy=6,则x^2y-xy^2=?,x^2y+xy^2=?
- 若x+2的绝对值等于（x-2y-6)的平方的相反数,则xy的值是?
- Why not listen to tapes?(改为同义句) — — listening tot
- he is running
- 凤仙花的各个组成部分的名称是哪六个
猜你喜欢
