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!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
计算 4(m+n)^2*(-m-n)^3-(m+n)(-m-n)^4+5(m+n)^5 请写出步骤...
9(m+n)^2-4(m-n)^2请计算上述题目!Thank you very much!
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