Đúng ghi Đ, sai ghi S. a) 3 - 7/18 = 47/18 ...

Đúng ghi Đ, sai ghi S.

a) \[3 - \frac{7}{{18}} = \frac{{47}}{{18}}\]           Đ

b) \[\frac{{62}}{9} - 6 = \frac{{54}}{9}\]                S

c) \[5 - \frac{{17}}{{12}} = \frac{{60}}{{12}}\]                S

d) \[\frac{{53}}{{15}} - 3 < 1\]                      Đ

Giải thích

a) \[3 - \frac{7}{{18}} = \frac{{54}}{{18}} - \frac{7}{{18}} = \frac{{47}}{{18}}\]                   

b) \[\frac{{62}}{9} - 6 = \frac{{62}}{9} - \frac{{54}}{9} = \frac{8}{9}\]                 

c) \[5 - \frac{{17}}{{12}} = \frac{{60}}{{12}} - \frac{{17}}{{12}} = \frac{{43}}{{12}}\]                   

d) \[\frac{{53}}{{15}} - 3 = \frac{{53}}{{15}} - \frac{{45}}{{15}} = \frac{8}{{15}} < 1\] do 8 < 15