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(x+y)虏-16(x-y)虏
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(x+y)虏-16(x-y)虏
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答案和解析
(x+y)²-16(x-y)²
=(x+y)²-(4x-4y)²
=(x+y+4x-4y)(x+y-4x+4y)
=(5x-3y)(-3x+5y)
=-(5x-3y)(3x-5y)
=(x+y)²-(4x-4y)²
=(x+y+4x-4y)(x+y-4x+4y)
=(5x-3y)(-3x+5y)
=-(5x-3y)(3x-5y)
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