已知A=2b³-3ab²+a³,B=a³+2b³-2b²a,求3A-4B.要有过程
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已知A=2b³-3ab²+a³,B=a³+2b³-2b²a,求3A-4B.要有过程
已知A=2b³-3ab²+a³,B=a³+2b³-2b²a,求3A-4B.要有过程
已知A=2b³-3ab²+a³,B=a³+2b³-2b²a,求3A-4B.要有过程
3A-4B=3(2b³-3ab²+a³)-4*(a³+2b³-2b²a)
=6b³-8b³-9ab²+8ab²+3a³-4a³
=-2b³-ab²-a³