Question

TÍNH NHANH

7 PHẦN 6 X 1 PHẦN 2 + 7 PHẦN 6 X 3 PHẦN 4 + 7 PHẦN 6 + 15 PHẦN 4

Answer 1

Có: \(\dfrac{7}{6}\times\dfrac{1}{2}+\dfrac{7}{6}\times\dfrac{3}{4}+\dfrac{7}{6}+\dfrac{15}{4}\)

\(=\dfrac{7}{6}\times\left(\dfrac{1}{2}+\dfrac{3}{4}+1\right)+\dfrac{15}{4}\)

\(=\dfrac{7}{6}\times\dfrac{9}{4}+\dfrac{15}{4}\)

\(=\dfrac{63}{24}+\dfrac{90}{24}=\dfrac{51}{8}\)

Answer 2

7/6 × 1/2 + 7/6 × 3/4 + 7/6 × 15/4

= 7/6 × (1/2 + 3/4 + 15/4)

= 7/4 × (2/4 + 3/4 + 15/4)

= 7/4 × 5

= 35/4