Question

bài 2 tính a 2/3 + 3/4 b 5/6 - 1/3 c 4/5 chia 3/4 d 2/5 x 15/8

Answer 1

a 2/3 + 3/4 = 8/12 + 9/12 = 17/12

b 5/6 - 1/3= 5/6 - 2/6 = 3/6 = 1/2

c 4/5 chia 3/4 = 4/5 x 4/3 = 16/15

d 2/5 x 15/8 = 30/40 = 3/4

Answer 2

a) = 17/12

b) = 1/2

c) =16/15

d) = 3/4

Answer 3

a 2/3 + 3/4

= 8/12 + 9/12

= 17/12

b 5/6 - 1/3

= 5/6 - 2/6

= 3/6 = 1/2

c 4/5 : 3/4

= 4/5 x 4/3

= 16/15

d 2/5 x 15/8

= 30/40 = 3/4

Answer 4

\(a,\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{8}{12}+\dfrac{9}{12}=\dfrac{17}{12}\)

\(b,\dfrac{5}{6}-\dfrac{1}{3}=\dfrac{5}{6}-\dfrac{2}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)

\(c,\dfrac{4}{5}:\dfrac{3}{4}=\dfrac{4}{5}\times\dfrac{4}{3}=\dfrac{16}{15}\)

\(d,\dfrac{2}{5}\times\dfrac{15}{8}=\dfrac{30}{40}=\dfrac{3}{4}\)

Answer 5

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Answer 6

 2/3 + 3/4 = 8/12 + 9/12 = 17/12

5/6 - 1/3= 5/6 - 2/6 = 3/6 = 1/2

 4/5 chia 3/4 = 4/5 x 4/3 = 16/15

 2/5 x 15/8 = 30/40 = 3/4

Answer 7

a. \(\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{8}{12}+\dfrac{9}{12}=\dfrac{17}{12}\)

b. \(\dfrac{5}{6}-\dfrac{1}{3}=\dfrac{5}{6}-\dfrac{2}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)

c. \(\dfrac{4}{5}:\dfrac{3}{4}=\dfrac{4}{5}\) x \(\dfrac{3}{4}=\dfrac{16}{15}\)

d. \(\dfrac{2}{5}\) x \(\dfrac{15}{8}=\dfrac{30}{40}=\dfrac{3}{4}\)