若m+n=3,则2m²+4mn+2n²-6的值为——
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 23:15:42
![若m+n=3,则2m²+4mn+2n²-6的值为——](/uploads/image/z/1124312-32-2.jpg?t=%E8%8B%A5m%2Bn%3D3%2C%E5%88%992m%26%23178%3B%2B4mn%2B2n%26%23178%3B-6%E7%9A%84%E5%80%BC%E4%B8%BA%E2%80%94%E2%80%94)
若m+n=3,则2m²+4mn+2n²-6的值为——
若m+n=3,则2m²+4mn+2n²-6的值为——
若m+n=3,则2m²+4mn+2n²-6的值为——
2m²+4mn+2n²-6
=2(n+m)²-6
=2x3²-6
=18-6
=12
2m²+4mn+2n²-6
=2(m²+2mn+n²)-6
=2(m+n)²-6
=2*9-6
=12
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 23:15:42
若m+n=3,则2m²+4mn+2n²-6的值为——
若m+n=3,则2m²+4mn+2n²-6的值为——
若m+n=3,则2m²+4mn+2n²-6的值为——
2m²+4mn+2n²-6
=2(n+m)²-6
=2x3²-6
=18-6
=12
2m²+4mn+2n²-6
=2(m²+2mn+n²)-6
=2(m+n)²-6
=2*9-6
=12