Question

Tính:

a) \(\dfrac{3}{5}\times\dfrac{6}{7}\)                          b) \(\dfrac{2}{9}\text{×}\dfrac{18}{3}\)                         c) \(\dfrac{5}{7}\text{×}12\)                          d) \(21\text{×}\dfrac{2}{7}\)

Answer 1

a)  $\frac{3}{5} \times \frac{6}{7} = \frac{{3 \times 6}}{{5 \times 7}} = \frac{{18}}{{35}}$                                                 

 b) $\frac{2}{9} \times \frac{{18}}{3} = \frac{{2 \times 18}}{{9 \times 3}} = \frac{{36}}{{27}} = \frac{4}{3}$

c)  $\frac{5}{7} \times 12 = \frac{{5 \times 12}}{7} = \frac{{60}}{7}$                                            

d)  $21 \times \frac{2}{7} = \frac{{21 \times 2}}{7} = \frac{{42}}{7} = 6$