Question

tính: a) 3/5 + 7/2 b) 14 - 1/9 c) 3/2 x 4 d) 7/8 : 5

Answer 1

a) \(\dfrac{3}{5}+\dfrac{7}{2}=\dfrac{6}{10}+\dfrac{35}{10}=\dfrac{41}{10}\)

b) \(14-\dfrac{1}{9}=\dfrac{14}{1}-\dfrac{1}{9}=\dfrac{126}{9}-\dfrac{1}{9}=\dfrac{125}{9}\)

c) \(\dfrac{3}{2}\times4=\dfrac{3\times4}{2}=\dfrac{12}{2}=6\)

d) \(\dfrac{7}{8}:5=\dfrac{7}{8}:\dfrac{5}{1}=\dfrac{7}{8}\times\dfrac{1}{5}=\dfrac{7}{40}\)

Answer 2

a) 3/5 + 7/2  = 6/10 + 35/10 = 41/10

b) 14 - 1/9 = 126/9 - 1/9 = 125/9

c) 3/2 x 4 = 12/2 = 6

d) 7/8 : 5 = 7/8 x 1/5 = 7/40

Answer 3

\(\dfrac{3}{5}+\dfrac{7}{2}=\dfrac{6+35}{10}=\dfrac{41}{10}\)

\(\dfrac{14}{1}-\dfrac{1}{9}=\dfrac{126}{9}-\dfrac{1}{9}=\dfrac{125}{9}\)

\(\dfrac{3}{2}\times\dfrac{4}{1}=\dfrac{3\times4}{2\times1}=6\)

\(\dfrac{7}{8}:\dfrac{5}{1}=\dfrac{7}{8}\times\dfrac{1}{5}=\dfrac{7\times1}{8\times5}=\dfrac{7}{40}\)