10道因式分解1.-7m(m-n)^3+21mn(n-m)^22.5x(x-2y)^2-10y(2y-x)^23.225(x-y)^2-196(x+y)^24.(5x-3y)^2-(3x-5y)^25.(5m^2+8n^2)^2-(4m^2+n^2)^26.x^3+x^2y-xy^2-y^37.9m^2-15m+4分之258.(a^2-1)^2+6(1-a^2)+99.a^2-9b^2+6b-110.mn^2-2mn+2n-4

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