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

3分之2m²-4mn+2n²
=2(m²-2mn+n²)/3
=2(m-n)²/3
=2×9/3
=6