3m+2n=7 3m-n=5m=?n=?
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3m+2n=7 3m-n=5m=?n=?
3m+2n=7 3m-n=5m=?n=?
3m+2n=7 3m-n=5m=?n=?
3m+2n=7(1)
3m-n=5(2)
(1)-(2)得:
2n+n=7-5=2;
n=2/3;
带入(1)得:
3m+4/3=7;
3m=17/3;
m=17/9;
如果本题有什么不明白可以追问,
3m+2n=7---(1)
3m-n=5 →n=3m-5---(2)
将(2)代入(1)得
3m+2(3m-5)=7
→3m+6m-10=7
→9m=17
→m=17/9---(3)
将(3)代入(2)得
n=17/9×3-5=17/3-5=2/3
答:m=17/9,n=2/3
m9分之17 n3分之2
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