1.如果2xy^2×A=6x^2y^2-4x^3y^2,则多项式A为2.(3x^2)^3-7x^3[x^3-x(4x^2+1)]
问题描述:
1.如果2xy^2×A=6x^2y^2-4x^3y^2,则多项式A为
2.(3x^2)^3-7x^3[x^3-x(4x^2+1)]
答
A=3x-2y^2
答
1.两边除以2xy^2 A=3x-2x^2
2.27x^6-7x^6+7x^4(4x^2+1)
=20x^6+28x^6+7x^4
=x^4*(48x^2+7)