3a平方b+2ab+负3ab平方+负4a平方b+3ab

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3a平方b+2ab+负3ab平方+负4a平方b+3ab3a平方b+2ab+负3ab平方+负4a平方b+3ab3a平方b+2ab+负3ab平方+负4a平方b+3ab=3a²b+2ab+(-3a

3a平方b+2ab+负3ab平方+负4a平方b+3ab
3a平方b+2ab+负3ab平方+负4a平方b+3ab

3a平方b+2ab+负3ab平方+负4a平方b+3ab
=3a²b+2ab+(-3ab²)+(-4a²b)+3ab
=3a²b+2ab-3ab²-4a²b+3ab
=-a²b+5ab