(x+3y)²-(x-3y)² 计算
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(x+3y)²-(x-3y)² 计算
(x+3y)²-(x-3y)² 计算
(x+3y)²-(x-3y)² 计算
(x+3y)²-(x-3y)²
=(x+3y+x-3y)(x+3y-x+3y)
=2x*6y
=12xy
(x+3y)²-(x-3y)² 计算
(x+3y)²-(x-3y)² 计算
(x+3y)²-(x-3y)² 计算
(x+3y)²-(x-3y)²
=(x+3y+x-3y)(x+3y-x+3y)
=2x*6y
=12xy