2m+9n=4.8 3m-5n=-15
已知m-2n/2m+n=5,求代数式3(m-2n)/2m+n-15(2m+n)/m-2n-2
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
若(m-2n)/(2m+n)=3,则[3(m-2n)/(2m+n)-(m-2n)/[2(2m+n)] - {9(m-2n
2m-3n/3m+5n=3 则(4m-6n/18m+30n)+9m+15n/4m-6n的值是多少
先化简,后求值:5(m+n)(m-n)-2(m+n)2-3(m-n)2,其中m=-2,n=15
m-{n-2m+[3m-(6m+3n)+5n]}=
(m+n)²-6(m+n)+9=(m+n)²+2(m+n)×(-3)+(-3)²=[(m+
若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
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
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?