（0.25a立方b-2分之1a立方b平方-6分之1a4次方b立方）除于（-0.5a平方b)
问题描述：
（0.25a立方b-2分之1a立方b平方-6分之1a4次方b立方）除于（-0.5a平方b)
答
=a^3b*(1/4-1/2b-1/6ab^2)*(2/a^2b)
=2a*(1/4-1/2b-1/6ab^2)
=(1/2)a-(ab)-(1/3(a^2b^2)