-1/3ab-1/4a平方+1/3a平方-(-2/3ab)
=-1/3ab-1/4a平方+1/3a平方+2/3ab
==-1/3ab+2/3ab—1/4a平方+1/3a平方
=ab+1/12a²
-1/3ab-1/4a平方+1/3a平方-(-2/3ab) =
-1/3ab-1/4a平方+1/3a平方-(-2/3ab) =
数学人气:592 ℃时间:2019-08-19 05:45:48
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