Tính nhanh  13/50 + 9% + 41/100 + 0,21

Hướng dẫn: 

\(\frac{{13}}{{50}} + 9\%  + \frac{{41}}{{100}} + 0,24 = \frac{{26}}{{100}} + \frac{9}{{100}} + \frac{{41}}{{100}} + \frac{{24}}{{100}} = \frac{{26 + 9 + 41 + 24}}{{100}} = \frac{{100}}{{100}} = 1\)