计算.a^2-[-4ab+(ab-a^2)]-2ab
问题描述:
计算.a^2-[-4ab+(ab-a^2)]-2ab
快
答
=a^2-(-3ab-a^2)-2ab
=a^2+3ab+a^2-2ab
=a^2+a^2+3ab-2ab
=2a^2+ab