求(x+2y)²-(x-2y)²的解答,要详细过程
(x+2y)²-(x-2y)²
=(x+2y+x-2y)(x+2y-x+2y)
=2x*4y
=8xy
利用平方差公式
(x+2y)²-(x-2y)²
=x²+4xy+4y²-x²+4xy-4y²
=8xy
(x+2y)²-(x-2y)²=(x+2y+x-2y)(x+2y-x+2y)=8xy。
(x+2y)²-(x-2y)²
=(x+2y+x-2y)(x+2y-x+2y)
=8xy
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(x+2y)²-(x-2y)²
=(x+2y+x-2y)(x+2y-x+2y)
=2x*4y
=8xy
利用平方差公式
(x+2y)²-(x-2y)²
=x²+4xy+4y²-x²+4xy-4y²
=8xy
(x+2y)²-(x-2y)²=(x+2y+x-2y)(x+2y-x+2y)=8xy。
(x+2y)²-(x-2y)²
=(x+2y+x-2y)(x+2y-x+2y)
=8xy