9(x+y)^2-16(x-y)^2
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9(x+y)^2-16(x-y)^2
9(x+y)^2-16(x-y)^2
9(x+y)^2-16(x-y)^2
原式=(3x+3y)^2-(4x-4y)^2
=(3x+3y+4x-4y)(3x+3y-4x+4y)
=(7x-y)(7y-x)
(x-y)(x-y)2(y-x) (x+2y-?)(x-2y+?)
9(x+y)^2-16(x-y)^2
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