作业帮3 m=5 3 n=7 3 n+m= 3 3n-2n=3 m=5 3 n=7 3 n+m= 3 3n-2n=
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3 m=5 3 n=7 3 n+m= 3 3n-2n=3 m=5 3 n=7 3 n+m= 3 3n-2n=
3 m=5 3 n=7 3 n+m= 3 3n-2n=
3 m=5
3 n=7
3 n+m=
3 3n-2n=
3 m=5 3 n=7 3 n+m= 3 3n-2n=3 m=5 3 n=7 3 n+m= 3 3n-2n=
n + m = 5 + 7 = 12
3n - 2n = 15 - 14 = 1
3(n+m)=12
3(3n-2n)=7
m/n=7/3则m+n/m-n
m-[n-3m-(m-n)]=?
.4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5=
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