已知a+b=-8,ab=5,求2[ab+(-3a)]-3(2b-ab)的值

问题描述:

已知a+b=-8,ab=5,求2[ab+(-3a)]-3(2b-ab)的值


2[ab+(-3a)]-3(2b-ab)
=2ab-6a-6b+3ab
=5ab-6(a+b)
=5×5-6×(-8)
=25+48
=73不用谢,记得采纳即可