化简1/6m-4n-1/6m+4n-3m/4n^2-9m^2
(m-n)2(n-m)3(n-m)4化简
1/2(m-n)+1/4(m+n)+m+n/3-m-n/6 其中m=-9 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)
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)
[(m-n)^2*(m-n)^3]^2/(m-n)^4
先化简,在求值(m+n)(m-n)(-m^2-n^2)-(-2m+n)(-2m-n)(4m^2+n^2) 其中m=1,n
化简(1/2m^4n^3+4m^3n^5-2/3m^3n^2)÷(-1/6m^3n^2)
先化简再求值:6m^2-5m(-m+2n-1)+4m(-3m-5/2n-3/4),其中m=-1,n=1/20
化简-3(m-n)²-(m-n)平方-3(m-n)+4m-n)的平方+2(m-n)-1
(3a^n-2)-6a^n+14a^n-1(因式分解) (m-n)^3+4(n-m)