计算:2/3a²-1/2ab+3/4a²+ab-b²
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计算:2/3a²-1/2ab+3/4a²+ab-b²
计算:2/3a²-1/2ab+3/4a²+ab-b²
计算:2/3a²-1/2ab+3/4a²+ab-b²
2/3a²-1/2ab+3/4a²+ab-b²
=17/12a²+1/2ab-b²
=1/12(17a²+6ab-12b²)
2/3a²-1/2ab+3/4a²+ab-b²
=2/3a²+3/4a²-1/2ab+ab-b²
=8/12a²+9/12a²-1/2ab+ab-b²
=17/12a²+1/2ab-b²