9(x-y)的平方-4(x+y)的平方因式分解
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9(x-y)的平方-4(x+y)的平方
=[3(x-y)+2(x+y)][3(x-y)-2(x+y)]
=(5x-y)(x-5y)
=[3(x-y)+2(x+y)][3(x-y)-2(x+y)]
=(5x-y)(x-5y)
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[9(x-y)]²-[4(x+y)]²=(9x-9y+4x+4y)(9x-9y-4x-4y)
=(13x-5y)(5x-13y)
9(x-y)²-4(x+y)²=(3x-3y+2x+2y)(3x-3y-2x-2y)
=(5x-y)(x-5y)
=(13x-5y)(5x-13y)
9(x-y)²-4(x+y)²=(3x-3y+2x+2y)(3x-3y-2x-2y)
=(5x-y)(x-5y)
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2010-09-27
展开全部
9(x-y)的平方-4(x+y)的平方
=[3(x-y)+2(x+y)][3(x-y)-2(x+y)]
=(5x-y)(x-5y)
=[3(x-y)+2(x+y)][3(x-y)-2(x+y)]
=(5x-y)(x-5y)
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