chứng minh rằng 9/10! +10/11! +11/12!+...+99/100! <1/9!
9/10! + 10/11! + 11/12! +. . . .+ 99/100! < 1/9!
CMR 9/10! +10/11!+11/12!+...+99/100!<1/9!
Chứng minh rằng \(\frac{9}{10!}+\frac{10}{11!}+\frac{11}{12!}+...+\frac{99}{100!}\) < \(\frac{1}{9!}\)
cho A=1/10+1/11+1/12+...+1/99+1/100. chung minh A> 1 , giup mk voi nha
a)Cho S = \(\frac{1}{1!}+\frac{1}{2!}+\frac{1}{3!}+...+\frac{1}{2012!}.\) Chứng minh rằng S< 2
b)Chứng minh rằng :\(\frac{9}{10!}+\frac{10}{11!}+\frac{11}{12!}+\frac{99}{100!}< \frac{1}{9!}\)
Ai làm nhanh mk l*** cho nhé !
1 Tính tổng :
9 + ( - 10 ) + 11 + ( - 12 ) + ... + 99 + ( - 100 )
CMR : `A = 9/10 . 11/12 . 13/14 . ... . 99/100 < 3/10`
bai 1 ;chung minh rang abcd chia het 99 thi ab cong cd chia het 99 va nguoc lai
bai 2;a.8 mu 10 tru 8 mu 9 tru 8 mu 8 chia het 55
b.7mu 6 cong 7 mu 5 tru 7 mu 4 chia het 11
d.10 mu 9 cong10 mu 8 cong 10 mu 7 chia het 555
c.81mu 7 cong 27 mu 9 tru 9 mu 13 chia het 45