求代数式(a³-2b³)+2(ab²- 1/2 a²b)-2(ab²-b³)的值.其中a=1,b=-1
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求代数式(a³-2b³)+2(ab²- 1/2 a²b)-2(ab²-b³)的值.其中a=1,b=-1
求代数式(a³-2b³)+2(ab²- 1/2 a²b)-2(ab²-b³)的值.其中a=1,b=-1
求代数式(a³-2b³)+2(ab²- 1/2 a²b)-2(ab²-b³)的值.其中a=1,b=-1
(a³-2b³)+2(ab²- 1/2 a²b)-2(ab²-b³)
=a³-2b³+2ab²- a²b-2ab²+2b³
=a³-a²b
=1-1×(-1)
=2
a³-2b³+2ab²-a²b-2ab²+2b³=a³-a²b
将a=1,b=-1代入得:1³-1²(-1)=2