Tính bằng cách thuận tiện. a) 7/16 + 5/2 + 1/16
23/30
Tính bằng cách thuận tiện.
a) \(\frac{7}{{16}} + \frac{5}{2} + \frac{1}{{16}}\)
b) \(\frac{{13}}{9} + \frac{3}{{14}} + \frac{5}{9} + \frac{{11}}{{14}}\)
Giải thích
a) \(\frac{7}{{16}} + \frac{5}{2} + \frac{1}{{16}} = \)\(\left( {\frac{7}{{16}} + \frac{1}{{16}}} \right) + \frac{5}{2} = \frac{8}{{16}} + \frac{5}{2} = \frac{1}{2} + \frac{5}{2} = \frac{6}{2} = 3\)
b) \(\frac{{13}}{9} + \frac{3}{{14}} + \frac{5}{9} + \frac{{11}}{{14}} = \) \(\left( {\frac{{13}}{9} + \frac{5}{9}} \right) + \left( {\frac{3}{{14}} + \frac{{11}}{{14}}} \right) = \frac{{18}}{9} + \frac{{14}}{{14}} = 2 + 1 = 3\)