3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 求m.m+n.n=?

3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 求m.m+n.n=? 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 急数学题x,y,m,n满足条件x/y=y/n=m/n=5/8,求x+y+m+n的最小值? 已知关于x,y的方程组{(n-8m)x-8y=10,5x+(10m+2n)y=-9和{3x+4y=-5,5x+6y=-9 解关于x,y的二元方程组：3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 已知M.N分别表示不同的单项式,且3x(M-5x)=6x*x*y*y*y+N,求M,N 已知单项式M N满足3x(M-5x)=6x^2y^2 求M N 若x^3m=4,y^3n=5,求（x^2m)^3+(y^n)^3—x^2m·y^n·x^4m·y^2n的值 若x^3m=4,y^3n=5,求（x^2m)^3+(y^3n)^2 集合M={X=3m+1,m∈N*},N={y/y=5n+2,n∈N*},则M∩N=? 若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m, 2x^6n-x^4n×y^3m-y^9m,已知x^2n=3,y^3n=2,求值