(x+y)²-(x-y)²等于多少
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(x+y)²-(x-y)²等于多少
(x+y)²-(x-y)²等于多少
(x+y)²-(x-y)²等于多少
4xy
4xy
4xy
初中数学,是4xy
(x+y)²-(x-y)²
=(x^2+y^2+2xy)-(x^2+y^2-2xy)
=2xy+2xy
=4xy