-3x^2a-b*y^2与1/3x^3a+b*y^5a+8b的积?注*为乘号

问题描述:

-3x^2a-b*y^2与1/3x^3a+b*y^5a+8b的积?注*为乘号
有谁会啊?请告诉我啊!谢谢了!

[-3x^(2a-b)y^2][x^(3a+b)y^(5a+8b)]/3
=(-3*1/3)[x^(2a-b)*x^(3a+b)][y^2y^(5a+8b)]
=-x^(2a-b+3a+b)y^(2+5a+8b)
=-x^(5a)y^(2+5a+8b)