Explicație pas cu pas:
[tex]a) \frac{1}{3} \times \frac{6}{13} \times 19 \frac{1}{2} = \\ \\ \frac{1}{3} \times \frac{6}{13} = \frac{1 \times 6}{3 \times 13} = \frac{6}{39} ^{(3} = \frac{2}{13} \\ \\ 19 \frac{1}{2} = \frac{19 \times 2 + 1}{2} = \frac{38 + 1}{2} = \frac{39}{2} \\ \\ \frac{2}{13} \times \frac{39}{2} = \frac{2 \times 39}{13 \times 2} = \frac{78}{26} ^{(26} = \frac{3}{1} = 3 [/tex]
