stwleaf
幼苗
共回答了19个问题采纳率:89.5% 举报
a=-1/2,b=2
(2a+b)(2a-b)+b(2a+b)-4a²÷b,
=4a²-b²+2ab+b²-4a²/b
=4a²+2ab-4a²/b
=4×(-1/2)²+2×(-1/2)×2-4×(-1/2)²/2
=1-2-1/2
=-3/2
1年前
追问
6
穆释
举报
2a+b2a-b+b2a+b-4a²bba=-2֮1b=2ô
举报
stwleaf
2a+b2a-b+b2a+b-4a²bb =4a²-b²+2ab+b²-4a²=2ab =2-1/22 =-2