解方程：n(21+19+2n)/2+(9-n)(32+16+2n)/2=241过程要清楚

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解方程：n(21+19+2n)/2+(9-n)(32+16+2n)/2=241过程要清楚解方程：n(21+19+2n)/2+(9-n)(32+16+2n)/2=241过程要清楚解方程：n(21+19+

解方程：n(21+19+2n)/2+(9-n)(32+16+2n)/2=241过程要清楚
解方程：n(21+19+2n)/2+(9-n)(32+16+2n)/2=241过程要清楚

解方程：n(21+19+2n)/2+(9-n)(32+16+2n)/2=241过程要清楚
n(21+19+2n)/2+(9-n)(32+16+2n)/2=241
n(40+2n)/2+(9-n)(48+2n)/2=241
n(20+n)+(9-n)(24+n)=241
20n+n^2+9(24+n)-n(24+n)=241
20n+n^2+216+9n-24n-n^2=241
5n+216=241
5n=25
n=5

n(21+19+2n)/2+(9-n)(32+16+2n)/2=241
n(40+2n)/2+(9-n)(48+2n)/2=241
n(20+n)+(9-n)(24+n)=241
20n+n^2+9*24+9n-24n-n^2=241
...

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n(21+19+2n)/2+(9-n)(32+16+2n)/2=241
n(40+2n)/2+(9-n)(48+2n)/2=241
n(20+n)+(9-n)(24+n)=241
20n+n^2+9*24+9n-24n-n^2=241
5n=241-216
5n=35
n=7

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n(21+19+2n)/2+(9-n)(32+16+2n)/2=241
n(40+2n)/2+(9-n)(48+2n)/2=241
n(20+n)+(9-n)(24+n)=241
20n+n²+216-24n+9n-n²=241
20n-24n+9n=241-216
5n=25
n=5
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