3+8+15+24+...+9800+9999
B = 2/3 + 2/15 + 2/35 + ......... + 2/9999 + 2/10403. C = 3/2 + 2/8 + 3/24 + ......... + 3/9800 + 3/10200. Các Bạn Jup Mình vs
B = \(\frac{2}{1.3}\)+ \(\frac{2}{3.5}\)+ \(\frac{2}{5.7}\) + ..... + \(\frac{2}{99.101}\)+ \(\frac{2}{101.103}\)
= 1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 +......+ 1/99 - 1/101 + 1/101 - 1/103
= 1- 1/103 = 102/103
Tích sau có tận cùng bao nhiêu chữ số 0? 3 × 8 × 15 × 24 × 35 × … × 9603 × 9800
Tính nhanh 15/16 × 24/25 × 35/36 ×...× 9999/10000
Bài 5:Tính
A=\(1\frac{1}{3}.1\frac{1}{8}.1\frac{1}{15}.1\frac{1}{24}.1\frac{1}{35}\cdot...\cdot1\frac{1}{9800}\)
Mấy số trên là hỗn số đó
\(A=\frac{4}{3}.\frac{9}{8}.\frac{16}{15}.\frac{25}{24}.\frac{36}{35}......\frac{9801}{9800}=\frac{\left(2.3.4.5....99\right)^2}{1.3.2.4.3.5.4.6.....98.100}=\frac{2.3.4.5...99}{1.2.3.4.....98}.\frac{2.3.4.5....99}{3.4.5.6......100}=\frac{99}{1}.\frac{2}{100}=\frac{99}{50}\)
A=4/3.9/8.16/15.25/24. ... .9801/9800
Tính được chưa
4/3* 9/8*16/15*25/24*.....*9801/9800
(4/ 3* 9/ 8* 16/ 15* 25/ 24......9801/ 9800)
=(2* 2* 3* 3* 4* 4* 5* 5......*99* 99)/ (1* 3* 2* 4* 3* 5* 4* 6......98* 100)
=((2* 3* 4* 5*......*99)/ (1* 2* 3* 4*....* 98))/ ((2* 3* 4*...99)/ (3* 4* 5*.....*100))
=99* (1/ 50)
=99/ 50
đúng thì k cho mình bn nha (^.^)
B=(1+1/15)*(1+1/24)*(1+1/35)*...*(1+1/9999)
B = 16/15 . 25/24 . ....... . 10000/9999
= 4.4/3.5 . 5.5/4.6 . ...... . 100.100/99.101
= 4.5. ..... .100/3.4. .... .99 . 4.5. ..... .100/5.6. ..... .101
= 100/3 . 4/101
= 400/303
Tk mk nha
Tính :
a) \(S=\frac{1}{5}+\frac{1}{20}+\frac{1}{44}+...+\frac{1}{1175}\)
b)\(S=1\frac{1}{3}.1\frac{1}{8}.1\frac{1}{15}.1\frac{1}{24}.1\frac{1}{35}.....1\frac{1}{9800}\)
tính nhanh: \(1\frac{1}{4}\times1\frac{1}{8}\times1\frac{1}{15}\times1\frac{1}{24}\times1\frac{1}{35}\times...\times1\frac{1}{9800}\)