Question

a) So sánh \(\frac{33}{131}\) và \(\frac{53}{217}\)

b) Cho B = \(\frac{15}{26}\) + \(\frac{10}{17}\) + \(\frac{8}{21}\). CMR: B < 2

Gấp !!!!!!!!

Answer 1

https://i.imgur.com/cyLEjWA.jpg

Answer 2

a) \(\frac{33}{131}>\frac{33}{132}=\frac{1}{4}\); \(\frac{53}{217}< \frac{53}{212}=\frac{1}{4}\)

Từ đó suy ra \(\frac{33}{131}>\frac{53}{217}\)

b) \(B< \frac{15}{17}+\frac{10}{17}+\frac{8}{17}=\frac{15+10+8}{17}=\frac{33}{17}< \frac{34}{17}=2^{\left(đpcm\right)}\)