若m+3的绝对值+n²-4n+4=0,则多项式3m²n+3mn²的值为
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 21:07:46
![若m+3的绝对值+n²-4n+4=0,则多项式3m²n+3mn²的值为](/uploads/image/z/1811229-69-9.jpg?t=%E8%8B%A5m%2B3%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%2Bn%26%23178%3B-4n%2B4%3D0%2C%E5%88%99%E5%A4%9A%E9%A1%B9%E5%BC%8F3m%26%23178%3Bn%2B3mn%26%23178%3B%E7%9A%84%E5%80%BC%E4%B8%BA)
若m+3的绝对值+n²-4n+4=0,则多项式3m²n+3mn²的值为
若m+3的绝对值+n²-4n+4=0,则多项式3m²n+3mn²的值为
若m+3的绝对值+n²-4n+4=0,则多项式3m²n+3mn²的值为
|m+3|+n²-4n+4=0
|m+3|+(n-2)²=0
∵|m+3|≥0
(n-2)²≥0
∴|m+3|=0
(n-2)²=0
解得 m=-3
n=2
故3m²n+3mn²
=3mn(m+n)
=3×(-3)×2×(-3+2)
=18