已知a=-2014,b=1/2014,则多项式5a²+2ab-(7a²+3ab-2a²)的值等于?

问题描述:

已知a=-2014,b=1/2014,则多项式5a²+2ab-(7a²+3ab-2a²)的值等于?
快一些!


5a²+2ab-(7a²+3ab-2a²)
=(5a²-7a²+2a²)+(2ab-3ab)
=-ab
=-(-2014)×(1/2014)
=1