-3/4ab+2/3a^2b+ab-a^2b-1/2ab-5/3a^2b
2个回答
-3/4ab+2/3a^2b+ab-a^2b-1/2ab-5/3a^2b
=1/4ab-2a^2b+1/2ab
=3/4ab-2a^2
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