已知:A=a² b+2b³ -3ab²+a³,B=a³ -3ab² +2b³ -2b²a,求3A-4B.记得说明原因啊!
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/07 04:15:38
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已知:A=a² b+2b³ -3ab²+a³,B=a³ -3ab² +2b³ -2b²a,求3A-4B.记得说明原因啊!
已知:A=a² b+2b³ -3ab²+a³,B=a³ -3ab² +2b³ -2b²a,求3A-4B.
记得说明原因啊!
已知:A=a² b+2b³ -3ab²+a³,B=a³ -3ab² +2b³ -2b²a,求3A-4B.记得说明原因啊!
B应该是等于a³ -3ab² +2b³ -2a²b
3A-4B
=3(a² b+2b³ -3ab²+a³)-4(a³ -3ab² +2b³ -2a²b)
=3a² b+6b³ -9ab²+3a³ -4a³ +12ab² -8b³ +8a²b
=-a³+11a² b+3ab²-2b³
B=a³ -3ab² +2b³ -2b²a写错了吧