{m=2n+3} {4m+ +5n=-1}

.4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= -5m(-m+3n)+4m(-4m-5/2n),其中m=2,n=-1 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= 如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n= 如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少 (m-2n)^2+(3m-n)(2m+2n)-(2m+n)(2m-n) 已知m+n=4 mn=1 m/n=5/3,求（m/m+n）+（m/m+n)-（n^2/m^2-n^2) 已知m/n=5、,求（m/（m+n）)+(m/(m-n))-(n^2/(m^3-n^2)) (m-2n)(2n+m)-(-3m-4n)(4n-3m)= 1若m=n,则|m|=|n|;2若m=—n,则|m|=|n|;3若|m|=|n|,则m=—n;4若|m|=|n|,则m=n哪个对 已知2m-n=3,4m+3n=1,求5n(2m-n)^2-2(n-2m)^3的值式子 已知2m-n=3,4m+3n=1,求5n(2m-n)^2-2(n-2m)^3的值 不解方程组2m-n=3和4m+3n=1求5n(2m-n)^-2(n-2m)^的值 已知2m-n=3,4m+3n=1,求5n(2m-n)²-2(n-2m)³的值 不解方程组2m-n=3,4m+3n=1,求5n(2m-n)平方-2(n-2m)立方的值 2m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4 m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4 3m+4n-[2m+(5m-2n)-3n]其中m=n分之一=2