初一数学题求过程答案……
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2013-11-13 · 知道合伙人教育行家
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分解因式吗:
(1)原式=(x-y)+(x^2-y^2)
=(x-y)+(x+y)(x-y)
=(x-y)(x+y+1)
(2)原式=(m^2-4n^2)+(2m-4n)
=(m+2n)(m-2n)+2(m-2n)
=(m-2n)(m+2n+2)
(3)原式=x^2-(y^2+2y+1)
=x^2-(y+1)^2
=(x+y+1)(x-y-1)
(1)原式=(x-y)+(x^2-y^2)
=(x-y)+(x+y)(x-y)
=(x-y)(x+y+1)
(2)原式=(m^2-4n^2)+(2m-4n)
=(m+2n)(m-2n)+2(m-2n)
=(m-2n)(m+2n+2)
(3)原式=x^2-(y^2+2y+1)
=x^2-(y+1)^2
=(x+y+1)(x-y-1)
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