360/n =1/3(180-360/n),最后怎么等于8的?
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360/n =1/3(180-360/n),最后怎么等于8的?
360/n =1/3(180-360/n),最后怎么等于8的?
360/n =1/3(180-360/n),最后怎么等于8的?
360/n =1/3(180-360/n)
360/n=60-120/n
360=60n-120
60n=480
n=8
3*360/n=180-360/n
4*360/n=180
8*180/n=180
n=8
180n^2-207n=360,n=?
(n-2)*180/n=360/n*9
360/n+180*(n-2)=2005
360/n+(n-2)*180=2542.5
当n为正偶数,求证n/(n-1)+n(n-2)/(n-1)(n-3)+...+n(n-2).2/(n-1)(n-3)...1=n
360*( )=N*N*N,填几、N是几.
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推导 n*n!=(n+1)!-n!
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
360/n =1/3(180-360/n),最后怎么等于8的?
1*N+2*(N-1)+3*(N-2)+...+N*1=1/6N(N+1)(N+2)
用数学归纳法证明:(n+1)(n+2)(n+3)+.+(n+n)=(2^n)*1*3*.(2n-1)