如果m=1.4,n=2.7,求下列各式的值. 5m+3n 7n-4m 2m-n除以3
已知m+n=4,m-n=2,求下列各式的值:(1)mn(2)m^2+n^2(3)m^2-n^2(4)m^4+n^4
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-3/+(4+n)²=0 求下列各式的值:1.2m-n; 2.(m+n)的5次方-mn.
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
已知m/n=5/3 求(1/m+n+1/m-n)÷1/n-n/m-n÷m+n/n的值,
已知:m/n=5/3,求(1/m+n+1/m-n)÷1/n-n/m-n÷m+n/n的值
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
已知m^2=m+1 n^2=n+1且m不等于n求下列各式的值①m+n②mn
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
如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=