A=a³-2a²b+ab²,B=3a²b+2ab²-a²,且A=2B+C,求C的值,其中a=1,b=-1?
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A=a³-2a²b+ab²,B=3a²b+2ab²-a²,且A=2B+C,求C的值,其中a=1,b=-1?
A=a³-2a²b+ab²,B=3a²b+2ab²-a²,且A=2B+C,求C的值,其中a=1,b=-1?
A=a³-2a²b+ab²,B=3a²b+2ab²-a²,且A=2B+C,求C的值,其中a=1,b=-1?
A=2B+C
C=A-2B=a³-2a²b+ab²-2(3a²b+2ab²-a²)=a³-8a²b-3ab²+a²=1+8-3+1=7