> 数学 >
(x-y+z)² —(x+y-z)² 计算
人气:309 ℃ 时间:2020-05-28 08:05:02
解答
(x-y+z)² -(x+y-z)²
=[x-(y-z)]²-[x+(y-z)]²
=x²+(y-z)²-2x(y-z)-x²-(y-z)²-2x(y-z)
=-4x(y-z)
=4xz-4xy
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版