a²-ab=3,3ab-b-b²=4 求2(a²+ab-b²)+a²-2ab+b²
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a²-ab=3,3ab-b-b²=4 求2(a²+ab-b²)+a²-2ab+b²
a²-ab=3,3ab-b-b²=4 求2(a²+ab-b²)+a²-2ab+b²
a²-ab=3,3ab-b-b²=4 求2(a²+ab-b²)+a²-2ab+b²
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