作业帮已知:A=2a²+3ab-b²,B=-1/2ab,C=1/8a³b³-1/4a²b^4,求2A*B²-C.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/06 01:05:38
已知:A=2a²+3ab-b²,B=-1/2ab,C=1/8a³b³-1/4a²b^4,求2A*B²-C.
2A*B²-C
=2(2a²+3ab-b²)×(-1/2ab)²-(1/8a³b³-1/4a²b^4)
=2(2a²+3ab-b²)×1/4a²b²-(1/8a³b³-1/4a²b^4)
=a^4b²+3a³b³/2-a²b^4/2-1/8a³b³+1/4a²b^4
=a^4b²+11a³b³/8-a²b^4/4