因式分解(x+y)^2-(x-y)^2=

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因式分解(x+y)^2-(x-y)^2=
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因式分解(x+y)^2-(x-y)^2=
因式分解(x+y)^2-(x-y)^2=

因式分解(x+y)^2-(x-y)^2=
使用平方差公式
 
原式
=【(x+y)+(x-y)】【(x+y)-(x-y)】
=2x乘以2y
=4xy
 

(x+y+x-y)(x+y-x+y)
=2x×2y
=4xy

(x+y)²-(x-y)²
=(x+y+x-y)(x+y-x+y)
=2x×2y
=4xy

慢了