3(m-n)^2/18(n-m)^3怎么约分?
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3(m-n)^2/18(n-m)^3怎么约分?
3(m-n)^2/18(n-m)^3怎么约分?
3(m-n)^2/18(n-m)^3怎么约分?
3(m-n)^2/18(n-m)^3=3(n-m)^2/18(n-m)^3=1/6(n-m)
3(m-n)^2/18(n-m)^3 = 3(n-m)^2/18(n-m)^3 = (n-m)^2/6(n-m)^3 = 1/6(n-m)
ps (m-n)^2 = m^2 -2mn + n^2 = (n-m)^2
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