规定一种新运算a*b=a-b/ab,a*b=3,则分式2a+3ab-2b/b-2a

问题描述:

规定一种新运算a*b=a-b/ab,a*b=3,则分式2a+3ab-2b/b-2a
规定一种新运算a*b=a-b/ab,a*b=3,则分式2a+3ab-2b/b-2ab-a的值为多少?

9/5回答完毕将a-b=3ab代入即可谢了