{m/5-n/2=-2 {2(m+n+5)-(-m+n)=23
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m/5 - n/2 = -2
2m - 5n = - 10 ①
2(m+n+5) - (-m+n) = 23
2m+2n+10+m-n=23
3m+n = 13
n = 13 - 3m
代入 ①得 2m - 5(13-3m) = - 10
2m - 65+15m = -10
17m = 55
m = 55/17
n = 13 - 3m = 56/17
m/5 - n/2 = -2
2m - 5n = - 10 ①
2(m+n+5) - (-m+n) = 23
2m+2n+10+m-n=23
3m+n = 13
n = 13 - 3m
代入 ①得 2m - 5(13-3m) = - 10
2m - 65+15m = -10
17m = 55
m = 55/17
n = 13 - 3m = 56/17
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