a+b=-2,ab=3,求代数式(4ab-10b)-[7a-(3ab-3a)]值?

问题描述:

a+b=-2,ab=3,求代数式(4ab-10b)-[7a-(3ab-3a)]值?

(4ab-10b)-[7a-(3ab-3a)]=7ab-10b-10a=21-10*(-2)=41