来自顾永如的问题
求帮忙、因式分解、6xy^2-9x^2y-y^3=(a-b)^3(x-y)+(x+y)(a-b)^3=25(m-n)^2-9b^2(m-n)^2=
求帮忙、因式分解、6xy^2-9x^2y-y^3=(a-b)^3(x-y)+(x+y)(a-b)^3=25(m-n)^2-9b^2(m-n)^2=
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2020-09-12 00:21
求帮忙、因式分解、6xy^2-9x^2y-y^3=(a-b)^3(x-y)+(x+y)(a-b)^3=25(m-n)^2-9b^2(m-n)^2=
求帮忙、因式分解、6xy^2-9x^2y-y^3=(a-b)^3(x-y)+(x+y)(a-b)^3=25(m-n)^2-9b^2(m-n)^2=
6xy^2-9x^2y-y^3=-y(9x^2-6xy+y^2)=-y(3x-1)^2(a-b)^3(x-y)+(x+y)(a-b)^3=(a-b)^3(x-y+x+y)=2x(a-b)^325(m-n)^2-9b^2(m-n)^2=(m-n)^2(25-9b^2)=(m-n)^2(5+3b)(5-3b)