(x+y)方-16(x-y)方分解因试

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(x+y)方-16(x-y)方分解因试(x+y)方-16(x-y)方分解因试(x+y)方-16(x-y)方分解因试(x+y)方-16(x-y)方=(x+y+4x-4y)(x+y-4x+4y)=(5x-

(x+y)方-16(x-y)方分解因试
(x+y)方-16(x-y)方
分解因试

(x+y)方-16(x-y)方分解因试
(x+y)方-16(x-y)方
=(x+y+4x-4y)(x+y-4x+4y)
=(5x-3y)(5y-3x)
楼上的,你做错了

=(x+y+4x-4y)(x+y-4x+4y)=(5x+3y)(-3x+5y)
=(5x+3y)(5y-3x)