m^+4m+n^-2n+5=0,求4m+5n=?
m^+4m+n^-2n+5=0,求4m+5n=?
m平方+2M+N平方-4N+5=0,求M,N
如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
已知m=5 4/7,n=4 3/7, 求代数式[-7/2(m+n)]^3×(m-n)×[-2(m+n)(m-n)]^2的
如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=
已知m^2+9n^2+4m-6n+5=0,求m,n的值
已知m>0,n>0,m^2+n^2=5,mn=2求[6m^2-5m(-m+3n)+4m(-4m+5/2n)]×n的值
已知|2m-5|+(2m-5n+20)^2=0,求(-2m^2)-2m(5n-2m)+3n(6m-5n)-3n(4m-5
已知 |2m-5|+(2m-5n+20)的平方=0 求-2m的平方-2m(5n-2m)+3n(6m-5n)-3n(4m-
已知丨m-2丨+(n+5/1)²=0,求m-(m²n+3m-4n)+3(2nm²-3n)的
不解方程组2m-n=3和4m+3n=1求5n(2m-n)^-2(n-2m)^的值