若有理数m,n满足m-2n=4,2m-n=3,则m+n等于
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![若有理数m,n满足m-2n=4,2m-n=3,则m+n等于](/uploads/image/z/1747994-50-4.jpg?t=%E8%8B%A5%E6%9C%89%E7%90%86%E6%95%B0m%2Cn%E6%BB%A1%E8%B6%B3m-2n%3D4%2C2m-n%3D3%2C%E5%88%99m%2Bn%E7%AD%89%E4%BA%8E)
若有理数m,n满足m-2n=4,2m-n=3,则m+n等于
若有理数m,n满足m-2n=4,2m-n=3,则m+n等于
若有理数m,n满足m-2n=4,2m-n=3,则m+n等于
m-2n=4
2m-n=3
2m-4n=8
2m-n=3
-3n=5
n=-5/3
m=4-2*5/3=2/3
m+n=-5/3+2/3=-1
解由
m-2n=4,...............①
2m-n=3.................②
由②-①
得m+n=-1若有理数m,n满足m-2n=4,2m-n=3,则m+n等于
怎么算的?晕死。