Question

Bài 1. Tính
5/9 + 7/18
3 - 5/6
5/4 x 6/7
2 : 5/8

Answer 1

17/18

13/6

30/28

16/5

Answer 2

5/9 + 7/18 = 10/18 + 7/18 = 17/18
3 - 5/6= 18/6 - 5/6 = 13/6
5/4 x 6/7 = 15/14
2 : 5/8 = 2/1 x 8/5 = 16/5

Answer 3

\(\dfrac{5}{9}+\dfrac{7}{18}=\dfrac{10}{18}+\dfrac{7}{18}=\dfrac{17}{18}\)

\(\dfrac{18}{6}-\dfrac{5}{6}=\dfrac{13}{6}\)

\(\dfrac{5}{4}\times\dfrac{6}{7}=\dfrac{30}{28}=\dfrac{15}{14}\)

\(2\times\dfrac{8}{5}=\dfrac{16}{5}\)

Answer 4

\(=\dfrac{10}{18}+\dfrac{7}{18}=\dfrac{10+7}{18}=\dfrac{17}{18}\)

\(=\dfrac{18}{6}-\dfrac{5}{6}=\dfrac{18-5}{6}=\dfrac{13}{6}\)

\(=\dfrac{30}{28}\)

\(=\dfrac{2}{1}\times\dfrac{8}{5}=\dfrac{16}{5}\)

Answer 5

a)\(=\dfrac{10}{18}+\dfrac{7}{18}=\dfrac{17}{18}\)

b)\(=\dfrac{18}{6}-\dfrac{5}{6}=\dfrac{13}{6}\)

c)\(\dfrac{15}{14}\)

d)\(=2\times\dfrac{8}{5}=\dfrac{16}{5}\)

Answer 6

= 17/18

= 13/6

= 15/14

= 16/5

Answer 7

a. \(\dfrac{5}{9}+\dfrac{7}{18}=\dfrac{10}{18}+\dfrac{7}{18}=\dfrac{17}{18}\)

b. \(3-\dfrac{5}{6}=\dfrac{18}{6}-\dfrac{5}{6}=\dfrac{13}{6}\)

c. \(\dfrac{5}{4}.\dfrac{6}{7}=\dfrac{30}{28}\)

d. \(2:\dfrac{5}{8}=2.\dfrac{8}{5}=\dfrac{16}{5}\)

Answer 8

5/9 x 2 += 10/18

10/18 + 7/18 = 17/18