Question

\(\frac{5}{1.3}+\frac{5}{3.5}+\frac{5}{5.7}+.....+\frac{5}{91.93}+\frac{5}{93.95}\)tính

Answer 1

= 5- 5/3 + 5/3 - 5/5 + ... + 5/93 - 5/95

= 5 -5/95

= 90/95

Đ/s: 90/95

Answer 2

5/1.3 + 5/3.5 +5/5.7+....+5/91.93 + 5/93.95

= 5/2 . (1-1/3+1/3-1/5+1/5-1/7+....+1/91-1/93+1/93-1/95)

= 5/2 . (1-1/95)

= 5/2 . 94/95

= 47/19

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