若m+n=3,则2m²+4mn+2n²-6的值为
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![若m+n=3,则2m²+4mn+2n²-6的值为](/uploads/image/z/671688-0-8.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)
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(m²+2mn+n²)-6
=2(m+n)²-6
=2x3²-6
=18-6
=12
m+n=3
2m²+4mn+2n²-6
=2(m²+2mn+n²)-6
=2(m+n)²-6
=2*9-6
=18-6
=12
2m²+4mn+2n²-6
=2(m²+2mn+n²)-6
=2(m+n)²-6
=2*3²-6
=18-6
=12