Đáp án đúng: B
Giải chi tiết:Mẫu số chung : 12 , ta có :
\(\begin{array}{l}\frac{2}{3} = \frac{{2 \times 4}}{{3 \times 4}} = \frac{8}{{12}};\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{5}{6} = \frac{{5 \times 2}}{{6 \times 2}} = \frac{{10}}{{12}}\\\frac{3}{4} = \frac{{3 \times 3}}{{4 \times 3}} = \frac{9}{{12}};\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{1}{2} = \frac{{1 \times 6}}{{2 \times 6}} = \frac{6}{{12}}\end{array}\)
\( \Rightarrow \frac{6}{{12}} < \frac{8}{{12}} < \frac{9}{{12}} < \frac{{10}}{{12}}\,\,\,\,\,\,\,hay\,\,\,\frac{1}{2} < \frac{2}{3} < \frac{3}{4} < \frac{5}{6}\)
Sắp xếp từ bé đến lớn : \(\frac{1}{2};\,\frac{2}{3};\,\frac{3}{4};\,\frac{5}{6}\)
Chọn B