Question

câu 6 : tính                                                                                                                     a) 3/5 + 1/3          b) 17/20 - 4/5              c) 25/35 x 4/5             d) 7/15 : 6/7

Answer 1

a) 14/15

b) 1/20

c) 4/7

d) 49/50

Answer 2

\(a\) \(\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{9}{15}+\dfrac{5}{15}=\dfrac{14}{15}\)

\(b\) \(\dfrac{17}{20}-\dfrac{4}{5}=\dfrac{17}{20}-\dfrac{16}{20}-\dfrac{1}{20}\)

\(c\) \(\dfrac{25}{35}\times\dfrac{4}{5}=\dfrac{5}{7}\times\dfrac{4}{5}=\dfrac{4}{7}\)

\(d\) \(\dfrac{7}{15}:\dfrac{6}{7}=\dfrac{7}{15}\times\dfrac{7}{6}=\dfrac{49}{90}\)

Answer 3

a. 14/15

b. 1/20

c. 4/7

d. 49/90

Answer 4

\(\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{9}{15}+\dfrac{5}{15}=\dfrac{14}{15}\)

\(\dfrac{17}{20}-\dfrac{4}{5}=\dfrac{17}{20}-\dfrac{16}{20}=\dfrac{1}{20}\)

\(\dfrac{25}{35}\)x\(\dfrac{4}{5}=\dfrac{100}{175}=\dfrac{4}{7}\)

\(\dfrac{7}{15}:\dfrac{6}{7}=\dfrac{7}{15}\)x\(\dfrac{7}{6}\) \(=\dfrac{49}{90}\)

Answer 5

a,\(\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{9}{15}+\dfrac{5}{15}=\dfrac{14}{15}\)
b,\(\dfrac{17}{20}-\dfrac{4}{5}=\dfrac{17}{20}-\dfrac{16}{20}=\dfrac{1}{20}\)
c,\(\dfrac{25}{35}\)x\(\dfrac{4}{5}=\dfrac{4}{7}\)
d,\(\dfrac{7}{15}:\dfrac{6}{7}=\dfrac{7}{15}\)x\(\dfrac{7}{6}=\dfrac{49}{90}\)