化简求值:①5(3a²b-ab²)-4(-ab²+3a²b),其中a=-2,b=3

问题描述:

化简求值:①5(3a²b-ab²)-4(-ab²+3a²b),其中a=-2,b=3

5(3a²b-ab²)-4(-ab²+3a²b)
=15a²b-5ab²+4ab²-12a²b
=3a²b-ab²
=ab(3a-b)==54