Explicație pas cu pas:
[tex]a \times b = 7 \times 11 = 77[/tex]
[tex]a \times b = 5 \times 8 = 40[/tex]
[tex]a \times b = 0.(3) \times 15 = \frac{3}{9} \times 15 = \frac{15}{3}= 5 \\ [/tex]
[tex]a \times 9 = 20 \times 0.3(6) \\ 9a = 20 \times \frac{36 - 3}{90} \\9a = \frac{2 \times 33}{9} \\ a = \frac{2 \times 11}{3 \times 9} = \frac{22}{27} [/tex]
