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2m-{n+[4m-3(m+2n)]}-5n化简求值
(3m+2n)(3m+2n-m-n)怎么算
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
4m-7n-2(m-2n)怎么化简
计算(3-m+n)*(3+m-n)-(2-m+n)*(2+m-n)
(3m-4n)(4n+3m)-(2m-n)(2m+n)
计算或化简 (3m-n)(-3m-n)-(m-2n)^2-(m-2n)(2m-n)
2(m+n)2-(m+n)+4(m+n)-(m+n)2+3(m+n)2 化简求值
化简并求值:(m+n)2+(m+n)(m-3n);其中m=2
(m n)!/(m n-2)!-n!/(n-2)!=62怎么化简
(m+n)(m-n)/m+3n 怎么化简
m-{n-2m+[3m-(6m+3n)-5n]}化简