四道计算题(-2y^2-3x)(3x-2y^2) -(3m^2-n)(3m^2+n) (1/2a^m-b^n)(b^n+1/2a^m)(1/2x+y)(1/2x-y)(1/4x^2-y^2)
问题描述:
四道计算题(-2y^2-3x)(3x-2y^2) -(3m^2-n)(3m^2+n) (1/2a^m-b^n)(b^n+1/2a^m)
(1/2x+y)(1/2x-y)(1/4x^2-y^2)
答
能不能用文字表达