Question

Сократите дробь а) 51×26/13×17 на 13 б) 72×21/16×4 на 8 в) 42×26/19×18 на 3

Answer 1

Решение было долгим, писать лень ;)
а) 133
б)47.25
в)344

Answer 2

а)

$\frac{51 \times 26}{13 \times 17} = \frac{3 \times 17 \times 2 \times 3 \times 17}{13 \times 17} = \frac{6 \times 3}{1 \times 1} = \boxed{18}$

б)

$\frac{72 \times 21}{16 \times 4} = \frac{9 \times 8 \times 3 \times 7}{4 \times 4} = \frac{9 \times 3 \times 7}{2 \times 2} = \boxed{94.5}$

в)

$\frac{42 \times 26}{19 \times 18} = \frac{2 \times 3 \times 7 \times 2 \times 13}{19 \times 3 \times 6} = \frac{2 \times 7 \times 2 \times 13}{19 \times 1 \times 2} = \frac{182}{19} \approx \boxed{9.58}$