3(2a²-3ab)-2(a²-ab)+2(-a²+ab-b²)
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3(2a²-3ab)-2(a²-ab)+2(-a²+ab-b²)
3(2a²-3ab)-2(a²-ab)+2(-a²+ab-b²)3(2a²-3ab)-2(a²-ab)+2(-a²+ab-b²)
原式=6a²-9ab-2a²+2ab-2a²+2ab-2b²
=2a²-5ab-2b²=6a2-9ab-2a2+2ab-2a2+2ab-2b2
=2a2-5ab-2b2原式=6a^2-9ab-2a^2+2ab-2a^2+2ab-2b^2
=(6-2-2)a^2+(2+2-9)ab-2b^2
=2a^2-5ab-2b^2