若m-n=3,则3分之2m²-4mn+2n²的值为
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 07:06:36
![若m-n=3,则3分之2m²-4mn+2n²的值为](/uploads/image/z/1124304-24-4.jpg?t=%E8%8B%A5m-n%3D3%2C%E5%88%993%E5%88%86%E4%B9%8B2m%26%23178%3B-4mn%2B2n%26%23178%3B%E7%9A%84%E5%80%BC%E4%B8%BA)
若m-n=3,则3分之2m²-4mn+2n²的值为
若m-n=3,则3分之2m²-4mn+2n²的值为
若m-n=3,则3分之2m²-4mn+2n²的值为
3分之2m²-4mn+2n²
=2(m²-2mn+n²)/3
=2(m-n)²/3
=2×9/3
=6
原式=2(m²-2mn+n²)/3
=2(m-n)²/3
=2×3²/3
=6
1.3分之2m²-4mn+2n²
=2(m²-2mn+n²)/3
=2(m-n)²/3
=2×9/3
=6
2.2(m²-2mn+n²)/3
=2(m-n)²/3
=2×3²/3
=6