计算:5ab-a²-2(ab-3a)²
问题描述:
计算:5ab-a²-2(ab-3a)²
答
5ab-a²-2(ab-3a)²=5ab-a²-2(a²b²-6a²b+9a²)=5ab-a²-2a²b²+12a²b-18a²=5ab-19a²-2a²b²+12a²b
计算:5ab-a²-2(ab-3a)²
5ab-a²-2(ab-3a)²=5ab-a²-2(a²b²-6a²b+9a²)=5ab-a²-2a²b²+12a²b-18a²=5ab-19a²-2a²b²+12a²b