计算:(1)(m-n)^2*(n-m)^5*(m-n)^5 (2)(-x)^2*x^3+2x^3*(-x)^2-x*x^
计算:(1)(m-n)^2*(n-m)^5*(m-n)^5 (2)(-x)^2*x^3+2x^3*(-x)^2-x*x^
计算:(m+2n)/(n-m)+n/(m-n)-2m(n-m)和[(x+2)/(x×x-2x)-(x-1)/(x×x-4
计算(1)(3m-4n)(3m+4n)-(2m-2n)(2m+n) (2)(x+5y)²-(x-5y)
1.计算1(m+2n)(m-2n);2(2n+5)(n-3);3(x+2y)²;4(2x+b)(3x+d);
已知x^m=2,x^n=5.(1)x^m+n、x^m-n的值;(2)求x^3m-2n的值
已知x^m=3x^n=2,请计算x^(2m+3n)
已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N
已知x^m=2,x^n=3(m、n是正整数),求:(1)x^2m=3n;(2)x^2m+x^3n.
设不等式(m+n)x+(2m-3n)
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)
若x^m=6,x^n=9,则(2x^3m*x^2n) / (x^m*x^n)^2*x^n
已知x^m=1/3,x^n=2,求x^2m+3n