Đọc các số thập phân sau:  (1 điểm)

83,2: ……………………………………………………………………………………….

4,15: ……………………………………………………………………………………..

55,444: …………………………………………………………………………………….

a) \(\frac{3}{5}\) + \(\frac{{14}}{7}\) + \(\frac{4}{{10}}\)

= (\(\frac{3}{5}\) + \(\frac{4}{{10}}\)) + \(\frac{{14}}{7}\)

= 1 + 2

= 3

b) \(\frac{1}{7}\) + \(\frac{2}{7}\) + \(\frac{3}{7}\)+ \(\frac{4}{7}\) + \(\frac{5}{7}\) + \(\frac{6}{7}\)

= \(\frac{{1 + 2 + 3 + 4 + 5 + 6}}{7}\)

= \(\frac{{21}}{7}\)

= 3

a) \(\frac{4}{{25}}\) = \(\frac{{16}}{{100}}\) = 0,16

b) \(\frac{{72}}{{600}}\) = \(\frac{{12}}{{100}}\) = 0,12

c) \(\frac{1}{2}\) = \(\frac{5}{{10}}\) = 0,5

d) \(\frac{4}{{40}}\) = \(\frac{1}{{10}}\) = 0,1