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

来源：学生作业帮助网编辑：作业帮时间：2024/05/07 02:19:30

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
...

全部展开

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

收起

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
看懂了吗？请采纳！

解方程(2n+1)(n+1)n-(2n-21)(n-10)(n-11)=2(2n-9)(n-4)(n-5) 解方程：n(21+19+2n)/2+(9-n)(32+16+2n)/2=241过程要清楚解方程：2n（n-3)/2=n 解方程3m+5n+9=4m-2n-7 求n= 根号n+2n=253 根号n+2n=153 这种方程怎么解? 解方程：(2n+1)!/(2n-3)!=126n!/(n-3)! 解方程：(2n+1)!/(2n-3)!=126n!/(n-3)! 解一个方程,950n+(1/2)n(n-1)乘(-100)=5000求n {[n(n-1)]/2}*3=1.5n(n-1)这个方程怎么解》? 排列组合解方程C(n+1,n+3)=C(n-1,n-1)+C(n,n+1)+C(n-2,n) 3n-n^2=-2 解方程解方程2n-1=n+2 （2n+1)(2n+3)=111555解方程解方程（n-2)*180+360/n=600 解方程(n-2)×180=360n 解方程n(n-3)/2=271 n(n-3)/2=20这个方程怎么解? 方程2分之n(n-3)=20 求n