(3m-n)的平方-2(m-2n)(m+2n)

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(3m-n)的平方-2(m-2n)(m+2n)
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(3m-n)的平方-2(m-2n)(m+2n)
(3m-n)的平方-2(m-2n)(m+2n)

(3m-n)的平方-2(m-2n)(m+2n)
(3m-n)²-2(m-2n)(m+2n)
=9m²-6mn+n²-2(m²-4n²)
=9m²-6mn+n²-2m²+8n²
=7m²-6mn+9n²





(3m-n)²-2(m-2n)(m+2n)
原式=9m²-6mn+n²-2(m²-4n²)
=9m²-6mn+n²-2m²+8n²
=7m²-6mn+9n²
谢谢。。。的说