分解因式(x+y)^2-16(x-y)^2

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分解因式(x+y)^2-16(x-y)^2

分解因式(x+y)^2-16(x-y)^2
分解因式(x+y)^2-16(x-y)^2

分解因式(x+y)^2-16(x-y)^2
(x+y)^2-16(x-y)^2
=[(x+y)-4(x-y)][(x+y)+4(x-y)]
=(x+y-4x+4y)(x+y+4x-4y)
=(5y-3x)(5x-3y)

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

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

(5y-3x)(5x-3y)