Đúng ghi Đ, sai ghi Sa) \[\frac{1}{4} + 0 = \frac{1}{4}\]b) \[\frac{2}{3} + 1 = \frac{3}{3}\]c) \[\frac{5}{3} + \frac{2}{9} + \frac{1}{{18}} = \frac{8}{{18}}\]

Hướng dẫn giải

a) \[\frac{1}{4} + 0 = \frac{1}{4}\]	Đ
b) \[\frac{2}{3} + 1 = \frac{3}{3}\]	S
c) \[\frac{5}{3} + \frac{2}{9} + \frac{1}{{18}} = \frac{8}{{18}}\]	S

Giải thích

b) \[\frac{2}{3} + 1 = \frac{2}{3} + \frac{3}{3} = \frac{5}{3}\]

c) \[\frac{5}{3} + \frac{2}{9} + \frac{1}{{18}} = \frac{{30}}{{18}} + \frac{4}{{18}} + \frac{1}{{18}} = \frac{{35}}{{18}}\]