计算:(x^3)^n÷x^2n÷x^n-1
计算:(x^3)^n÷x^2n÷x^n-1
计算(x^(2n)+x^n+1)(x^(3n)-x^(2n)+1)
计算x^3n/(x^2-1)-x^2n/(x^n+1)-1/(x^n-1)+1/(x^n+1)
计算(x-y)^3n*(y-x)^2n÷(y-x)^5n(n为正整数,且x≠y)
计算(-x)^2n十1.(-x)^n+1
计算:1/(x-1)+1/(x-1)(x-2)+1/(x-2)(x-3)+.+1/(x-n)(x-n-1)
计算【-2(-x^n-1)】^3
几道分式计算.【1】[1/(m+n)^2-1/(m-n)^2]÷(1/m+n-1/m-n)【2】2/3x-(2/x+y)
、计算:x^3m+2n÷x^m+n=
设集合P={X/X=N,N∈N*},Q={X/X=N÷2,N∈N*},R={X/X=N-1÷2,N∈N*},则下列关系式
计算:(m+2n)/(n-m)+n/(m-n)-2m(n-m)和[(x+2)/(x×x-2x)-(x-1)/(x×x-4
单项式除以单项式 -x^n-2y^n+1÷(-4x^n-4y^n-3)