指出下列运算错误之处并加以改正a(a²-ab+b²)-b(a²+ab+b²)=a³-a²b+ab²-ba²+ab²+b³=a³-2a²b+2ab²+b³负2xy(x²-3x+1)=(负2xy)x²+(负2xy)(负3x)=2x³y+6x²y

指出下列运算错误之处并加以改正a(a²-ab+b²)-b(a²+ab+b²)=a³-a²b+ab²-ba²+ab²+b³=a³-2a²b+2ab²+b³负2xy(x²-3x+1)=(负2xy)x²+(负2xy)(负3x)=2x³y+6x²y
指出下列运算错误之处并加以改正
a(a²-ab+b²)-b(a²+ab+b²)
=a³-a²b+ab²-ba²+ab²+b³
=a³-2a²b+2ab²+b³
负2xy(x²-3x+1)
=(负2xy)x²+(负2xy)(负3x)
=2x³y+6x²y

指出下列运算错误之处并加以改正a(a²-ab+b²)-b(a²+ab+b²)=a³-a²b+ab²-ba²+ab²+b³=a³-2a²b+2ab²+b³负2xy(x²-3x+1)=(负2xy)x²+(负2xy)(负3x)=2x³y+6x²y