若m-n=3,则3分之2m²-4mn+2n²的值为
问题描述：
若m-n=3,则3分之2m²-4mn+2n²的值为
答
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
答
原式=2(m²-2mn+n²)/3
=2(m-n)²/3
=2×3²/3
=6
答
3分之2m²-4mn+2n²
=2(m²-2mn+n²)/3
=2(m-n)²/3
=2×9/3
=6