(x+y)²-16(x-y)²这个怎么算?

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(x+y)²-16(x-y)²这个怎么算?(x+y)²-16(x-y)²这个怎么算?(x+y)²-16(x-y)²这个怎么算?(x+y)&#

(x+y)²-16(x-y)²这个怎么算?
(x+y)²-16(x-y)²
这个怎么算?

(x+y)²-16(x-y)²这个怎么算?
(x+y)²-16(x-y)²
=(x+y)²-(4x-4y)²
=(x+y+4x-4y)(x+y-4x+4y)
=(5x-3y)(5y-3x)
如追加其它问题,

(x+y)²-16(x-y)²
=(x+y+4x-4y)(x+y-4x+4y)
=(5x-3y)(-3x+5y)