Question

2.Tính giá trị biểu thức 

a) ( 42 - \(\dfrac{5}{6}\) x \(\dfrac{36}{5}\)) :  \(\dfrac{1}{2}\) + \(\dfrac{7}{6}\)                               b) \(\dfrac{18}{5}\) - \(\dfrac{1}{7}\) x  2 + \(\dfrac{1}{3}\)

Answer 1

a) ( 42- 6) : 1/2 + 7/6

= 36 : 1/2 + 7/6

= 72 + 7/6

= 439/6

b) 18/5 - 2/7 + 1/3

= 383/105

Answer 2

a) = ( 42 - 6) : 1/2 + 7/6 

= 36 : 1/2 + 7/6

= 72 + 7/6

= 439/6

b) = 18/5 - 2/7 + 1/3

= 116/35 + 1/3

= 383/105

Answer 3

\(a.=\left(42-6\right):\dfrac{1}{2}+\dfrac{7}{6}\)

\(=36:\dfrac{1}{2}+\dfrac{7}{6}\)

\(=\)\(72+\dfrac{7}{6}\)

\(=\dfrac{439}{6}\)

Answer 4

\(b.=\dfrac{18}{5}-\dfrac{2}{7}+\dfrac{1}{3}\)

\(=\dfrac{383}{105}\)