化简:2m-(3m-4n)+(7m-2n)
(m-n)2(n-m)3(n-m)4化简
[(m-n)^2*(m-n)^3]^2/(m-n)^4
计算1/(m-n)-1/(m+n)-2n/(m^2+n^2)-4n^3/(m^4+n^4)-8n^7/(m^8+n^8)
(3m-4n)(4n+3m)-(2m-n)(2m+n)
[2(m+n)^5-3(m+n)^4+(-m-n)^3]÷[2(m+n)^3]
计算(m+4n)(m-n)-6(m+2n)(m-3n)
(m+4n)(m-n)-6(m+2n)(m-3n),
(m+4n)(m-n)-6(m+2n)(m-3n)
分式加减法:化简:2m/m-n-n/n-m+m+2n/n-m
化简:2m-(3m-4n)+(7m-2n)
2(m+n)2-(m+n)+4(m+n)-(m+n)2+3(m+n)2 化简求值
计算4(m+n)^2·(-m-n)^3-(m+n)(-m-n)^4+5(m+n)^5