> 数学 >
化简 (x减y)(x加y)加(x减y)加(x加y)等于
人气:486 ℃ 时间:2020-07-17 21:38:17
解答
(x-y)(x+y)+(x-y)(x+y)
=2*(x-y)(x+y)
=2(x^2-y^2)
=2x^2-2y^2
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版