Question

Câu 1:

a. Tìm x:               x : 5 = 4/7 + 1/2   

b. Tính giá trị của biểu thức :

                                                          1/3 + 2/9 × 3/4

Answer 1

a: \(x:5=\dfrac{15}{14}\\ \Rightarrow x=\dfrac{15}{70}=\dfrac{3}{14}\)

Answer 2

a) \(x:5=\dfrac{4}{7}+\dfrac{1}{2}\)

\(\dfrac{x}{5}=\dfrac{15}{14}\)

\(\Rightarrow x=\dfrac{5.15}{14}=\dfrac{75}{14}\)

b) \(\dfrac{1}{3}+\dfrac{2}{9}\times\dfrac{3}{4}=\dfrac{1}{3}+\dfrac{1}{6}=\dfrac{2}{6}+\dfrac{1}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)

Answer 3

\(x\div5=\dfrac{4}{7}+\dfrac{1}{2}\)

\(x\div5=\dfrac{15}{14}\)

\(x=\dfrac{15}{14}\times5\)

\(x=\dfrac{75}{14}\)

b)

\(\dfrac{1}{3}+\dfrac{2}{9}\times\dfrac{3}{4}\)

\(=\dfrac{1}{3}+\dfrac{1}{6}\)

\(=\dfrac{1}{2}\)

Answer 4

Answer 5

16/18

24/27

32/36

40/45

48/54

56/63