计算(1)(-3分之2A^7B^5)/2分之3A^2B^5 (2)(5分之6A^3X^4-0.9AX^3)/5分之3AX^3 (3)(7X^2Y^3-8^3y^2Z)/8X^2Y
问题描述：
计算(1)(-3分之2A^7B^5)/2分之3A^2B^5 (2)(5分之6A^3X^4-0.9AX^3)/5分之3AX^3 (3)(7X^2Y^3-8^3y^2Z)/8X^2Y
答
(1)(-2/3A^7B^5)/(3/2A^2B^5)=-4/9A^(7-2)B^(5-5)=-4/9A^5 (2)(6/5A^3X^4-0.9AX^3)/(3/5)AX^3 =6/5A^3X^4/(3/5)AX^3 -0.9AX^3/(3/5)AX^3 =2A^2X-1.5(3)(7X^2Y^3-8^X3y^2Z)/8X^2Y=7X^2Y^3/8X^2Y-8^X3y^2Z/8X^2Y=7/8Y^...