若M.N满足{M+2N=8,2M+N=7}则M减去N=?
2个回答
因为M+2N=8,(1)
2M+N=7,(2)
(2)-(1)得
m-n=-1.
相关问题
若m,n满足m+2n=8,2m+n=7,则m+n=
若实数m n 满足(m+n)(m+n-2)-8=0 则m+n=?
若m、n满足|m-n|+(n+1)2=0,则m+n=______.
若(m+n)²=2,(m-n)²=8 .则m²+n²=
若|m|=7,则m=______;若n2=36,则n=______,m+n=______.
若m-n=7,m2-n2=14,则m+n=______.
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=
若m^2-n^2=1/8 m-n=1/2 则m+n=?
若|m-2|+n2-8n+16=0,则m= ___ ,n= ___ .