(x+y/2)²-(x-y/2)²等于

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/27 05:14:15
(x+y/2)²-(x-y/2)²等于

(x+y/2)²-(x-y/2)²等于
(x+y/2)²-(x-y/2)²等于

(x+y/2)²-(x-y/2)²等于
(x+y/2)²-(x-y/2)²等于2xy

=(x+y)^2/4-(x-y)^2/4
=4xy/4
=xy