值
|a-b|=b-a
b>a
b=-2ï¼åa<-2
|a|=3
a=3(èå»)æa=-3
3a²-[7b-(4a-b)a²]
=3a²-7b+4a³-a²b
=3·(-3)²-7·(-2)+4·(-3)³-(-3)²Â·(-2)
=27+14-108+18
=-49
b>a
b=-2ï¼åa<-2
|a|=3
a=3(èå»)æa=-3
3a²-[7b-(4a-b)a²]
=3a²-7b+4a³-a²b
=3·(-3)²-7·(-2)+4·(-3)³-(-3)²Â·(-2)
=27+14-108+18
=-49
温馨提示:答案为网友推荐,仅供参考