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?

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?