(3b)^2= 2.—（ab）^2 3.（-4a^2）^3 4.（y^2z^3)^3 5.(xy^3n)^2+(xy^6)^n 6.(-3x^3)^2-[（2x）^2]^3
问题描述：
(3b)^2= 2.—（ab）^2 3.（-4a^2）^3 4.（y^2z^3)^3 5.(xy^3n)^2+(xy^6)^n 6.(-3x^3)^2-[（2x）^2]^3
答
(3b)^2 = 9b^2-(ab)^2 = -a^2b^2(-4a^2)^3 = -64a^6(y^2z^3)^3 = y^6z^9(xy^(3n))^2+(xy^6)^n = x^2y^(6n) + x^ny^(6n)(-3x^3)^2-[(2x)^2]^3 = 9x^6 - 8x^6 = x^6