Question

Tính.

a) \(\dfrac{6}{11}+\dfrac{1}{2}\)                  b) \(\dfrac{3}{10}+\dfrac{5}{21}\)               c) \(\dfrac{11}{4}-\dfrac{7}{5}\)               d) \(\dfrac{20}{18}-\dfrac{2}{5}\)

Answer 1

a) $\frac{6}{{11}} + \frac{1}{2} = \frac{{12}}{{22}} + \frac{{11}}{{22}} = \frac{{23}}{{22}}$                                                                                             

b) $\frac{3}{{10}} + \frac{5}{{21}} = \frac{{63}}{{210}} + \frac{{50}}{{210}} = \frac{{113}}{{210}}$    

c) $\frac{{11}}{4} - \frac{7}{5} = \frac{{55}}{{20}} - \frac{{28}}{{20}} = \frac{{27}}{{20}}$                                                           

d) $\frac{{20}}{{18}} - \frac{2}{5} = \frac{{10}}{9} - \frac{2}{5} = \frac{{50}}{{45}} - \frac{{18}}{{45}} = \frac{{32}}{{45}}$