9(m+n)^2-4(m-n)^2请计算上述题目!Thank you very much!

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9(m+n)^2-4(m-n)^2请计算上述题目!Thankyouverymuch!9(m+n)^2-4(m-n)^2请计算上述题目!Thankyouverymuch!9(m+n)^2-4(m-n)^

9(m+n)^2-4(m-n)^2请计算上述题目!Thank you very much!
9(m+n)^2-4(m-n)^2
请计算上述题目!
Thank you very much!

9(m+n)^2-4(m-n)^2请计算上述题目!Thank you very much!
9(m+n)^2-4(m-n)^2
=[3(m+n)+2(m-n)][3(m+n)-2(m-n)]
=(5m-n)(m+5n)

9(m+n)^2-4(m-n)^2
=[3(m+n)+2(m-n)][3(m+n)-2(m-n)]
=(5m-n)(m+5n)
=5m^2+24mn-5n^2