> 数学 >
3x²y-3y²x+2xy²-2x²y,其中x=二分之一y=-1
人气:424 ℃ 时间:2020-03-21 20:27:53
解答
3x²y-2x²y-3y²x+2xy²
=x²y-xy²
=xy(x-y)
x=-1
y=-2
3x²y-2x²y-3y²x+2xy²
=x²y-xy²
=xy(x-y)
=2(-1+2)
=2
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版