已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B 已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B
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![已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B 已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B](/uploads/image/z/603325-37-5.jpg?t=%E5%B7%B2%E7%9F%A5A%3Da%26%23178%3Bb%2B2b%26%23179%3B-3ab%26%23178%3B%2Ba%26%23179%3B%2CB%3D-a%26%23179%3B-3ab%26%23178%3B%2B2b%26%23179%3B-2b%26%23178%3Ba%2C%E6%B1%823A-4B+%E5%B7%B2%E7%9F%A5A%3Da%26%23178%3Bb%2B2b%26%23179%3B-3ab%26%23178%3B%2Ba%26%23179%3B%2CB%3D-a%26%23179%3B-3ab%26%23178%3B%2B2b%26%23179%3B-2b%26%23178%3Ba%2C%E6%B1%823A-4B)
已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B 已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B
已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B
已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B
已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B 已知A=a²b+2b³-3ab²+a³,B=-a³-3ab²+2b³-2b²a,求3A-4B
3A-4B
=3a²b+6b³-9ab²+3a³+4a³+12ab²-8b³+8b²a
=3a²b+6b³+11ab²-a³