a与b的和是-2,a与b的积是1,则(-4a-3)-(2ab+4b)=___________.
问题描述:
a与b的和是-2,a与b的积是1,则(-4a-3)-(2ab+4b)=___________.
答
(-4a-3)-(2ab+4b)= -4a-3-2ab-4b
= -4(a+b)-2ab-3
= -4(-2)-2-3
=8-2-3
=3