Question

Repede,dau 50 de puncte+coroană!!!​

Answer 1

Explicație pas cu pas:

$a \times b = 7 \times 11 = 77$

$a \times b = 5 \times 8 = 40$

$a \times b = 0.(3) \times 15 = \frac{3}{9} \times 15 = \frac{15}{3}= 5$

$a \times 9 = 20 \times 0.3(6) \\ 9a = 20 \times \frac{36 - 3}{90} \\9a = \frac{2 \times 33}{9} \\ a = \frac{2 \times 11}{3 \times 9} = \frac{22}{27}$