分解因式9(x+y)2-(x-y)22指平方

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分解因式9(x+y)2-(x-y)22指平方分解因式9(x+y)2-(x-y)22指平方分解因式9(x+y)2-(x-y)22指平方原式=[3(x+y)]²-(x-y)²=[3(x

分解因式9(x+y)2-(x-y)22指平方
分解因式9(x+y)2-(x-y)2
2指平方

分解因式9(x+y)2-(x-y)22指平方
原式=[3(x+y)]²-(x-y)²
=[3(x+y)+(x-y)][3(x+y)-(x-y)]
=(4x+2y)(2x+4y)
=4(2x+y)(x+2y)


9(x+y)²-(x-y)²
=[3(x+y)-(x-y)][3(x+y)+(x-y)]
=(2x+4y)(4x+2y)
=4(x+2y)(2x+y)

4(2x+y)(x+2y)