若2^n=9,4^m=3,求2^2n-4m+1=_____

若m-n=4,mn=-1求(9-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn) 如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少 如果m-3n+4=0 求(m-3n)^2+7m^3-3(2m^3n-m^2n-1)+3(m^3+2m^3n-m^2n+n 若m-n=3,3m+2n=2,求代数式6m（m-n）-4n（n-m）的值 已知M=1/3,N=1/27,求(M-N/根号M-根号N)+(M+4N-4根号MN/根号M-2N)的值. 已知m=1/3,n=1/27,求m-n/根号m-根号n+(m+4n-4根号mn)/根号m-2根号n 若9^m=4分之1 3^n=2 求9^m+n 若（2m-n)2=3mn,求代数式n/m+4m/n-1的值 m+2n=2,3m+4n=8,求m+n=几 {-3/2m+n=4 {2m+n=-3 求m,n 注意, m+2n=2且3m+4n=8,求m+n 若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n