作业帮已知(a+2)²+(3b-1)²=0,求3a²b-2[2ab²-6（ab-a²b）+4ab]－2ab的值
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/28 19:31:29
![已知(a+2)²+(3b-1)²=0,求3a²b-2[2ab²-6（ab-a²b）+4ab]－2ab的值](/uploads/image/z/3025481-41-1.jpg?t=%E5%B7%B2%E7%9F%A5%28a%2B2%29%26%23178%3B%2B%283b-1%29%26%23178%3B%3D0%2C%E6%B1%823a%26%23178%3Bb-2%5B2ab%26%23178%3B-6%EF%BC%88ab-a%26%23178%3Bb%EF%BC%89%2B4ab%5D%EF%BC%8D2ab%E7%9A%84%E5%80%BC)
已知(a+2)²+(3b-1)²=0,求3a²b-2[2ab²-6（ab-a²b）+4ab]－2ab的值
已知(a+2)²+(3b-1)²=0,求3a²b-2[2ab²-6（ab-a²b）+4ab]－2ab的值
已知(a+2)²+(3b-1)²=0,求3a²b-2[2ab²-6（ab-a²b）+4ab]－2ab的值
已知(a+2)²+(3b-1)²=0,
a+2=0,3b-1=0
a=-2,b=1/3
所以
3a²b-2[2ab²-6（ab-a²b）+4ab]－2ab
=3a²b-4ab²＋12ab-12a²b-8ab-2ab
=-9a²b-4ab²＋2ab
=ab(-9a-4b+2)
=-2×1/3×（-9×(-2)-4×1/3＋2）
=-2/3×（18-4/3+2）
=-2/3×56/3
=-112/9