(x+y/2)²-(x-y/2)²等于
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(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-(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