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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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
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=
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)^3
25(m-n)^2-9b^2(m-n)^2
=(m-n)^2(25-9b^2)
=(m-n)^2(5+3b)(5-3b)
6xy^2-9x^2y-y^3
=-y(y^2-6xy+9x^2)
=-y(y-3x)^2
( a-b)^3(x-y)+(x+y)(a-b)^3
=(a-b)^3(x-y+x+y)
=2x(a-b )^3
25(m-n)^2-9b^2(m-n)^2
=(5m-5n-3bm+3bn)(5m-5n+3bm-3bn)
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