若m-n=3,则3分之2m²-4mn+2n²的值为

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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+2n

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