若2^x=m 2^=n 求8^(x+y)的值 若3.9^n×27^n=3^21 求n 的值 若2x+5y-4=0 求4^x×32^y的值

若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m,n的值 已知x,y是实数,集合m{x,y已知x,y是实数,集合m={x,y/x,1},n={x^2,x+y,0}.若m=n,求x^2012+y^2012的值 若单项式M,N满足2x（M+3x）=6*x*x*y*y+N,求M,N 若a(x^3m)y^12/(3(x^2)y^2n)=4x^6y^8求2m+n-a 已知x^3m=8,y^3n=27,求（x^2m)^3+(y^n)^3-x^2m*y^n 若-2x^2*y(-x^m*y+3xy^3)=2x^5y^2-6x^3y^n,求m,n的值? 已知x^m+n=9,y^m+n=16,求（-三分之一*x^m*y^n)^2*x^2n*y^2n的值? 已知x^m+n=9,y^m+n=16,求（-三分之一*x^m*y^n)^2*x^2n*y^2n的值? 已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求M、N. 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 2m+n=x 2n+m=y 求m-n的最小值 若x^3m=4,y^3n=5,求（x^2m)^3+(y^3n)^2 3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 求m.m+n.n=? 若x^3m=4,y^3n=5,求(x^2m)^3+(y^n)^3-x^2n*y^n*x^4m*y^2n的值 若x^3m=4,y^3n=5,求(x^2m)^3+(y^n)^3-x^2n*y^n*x^4m*y^2n的值 若x^3m=4,y^3n=5,求（x^2m)^3+(y^n)^3—x^2m·y^n·x^4m·y^2n的值 已知x^3m=8,y^3n=27,求(2^2m)^3+(y^n)^3-x^2m*y^n的值.