计算:3xy-4xy-(-2xy)3xy-4xy-(-2xy)-1/3ab-1/4a²+1/3a²-(-2/3ab)

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计算:3xy-4xy-(-2xy)3xy-4xy-(-2xy)-1/3ab-1/4a²+1/3a²-(-2/3ab)

计算:3xy-4xy-(-2xy)3xy-4xy-(-2xy)-1/3ab-1/4a²+1/3a²-(-2/3ab)
计算:3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
-1/3ab-1/4a²+1/3a²-(-2/3ab)

计算:3xy-4xy-(-2xy)3xy-4xy-(-2xy)-1/3ab-1/4a²+1/3a²-(-2/3ab)
3xy-4xy-(-2xy)=-xy+2xy=xy
-1/3ab-1/4a²+1/3a²-(-2/3ab)
=-1/12(4ab+3a²-4a²-8ab)
=-1/12a²+1/3ab

3xy-4xy-(-2xy)
=xy+2xy
=3xy
-1/3ab-1/4a²+1/3a²-(-2/3ab)
=-1/3ab-(-2/3ab) -1/4a²+1/3a²
=1/3ab-1/12a²

3xy-4xy-(-2xy)=-xy+2xy=xy