Ответ:
Распределительный закон умножения.
<span>Запишите в виде дроби частное:
1) 5:7 =
![\frac{5}{7}](https://tex.z-dn.net/?f=+%5Cfrac%7B5%7D%7B7%7D+)
2) 19:4= </span><span>
![\frac{19}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B19%7D%7B4%7D+)
= 4 </span><span>
![\frac{3}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B3%7D%7B4%7D+)
3) 1:6 = </span><span>
![\frac{1}{6}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B6%7D+)
4) 30:4 = </span><span>
![\frac{30}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B30%7D%7B4%7D+)
= 7 </span><span>
![\frac{2}{4}](https://tex.z-dn.net/?f=+%5Cfrac%7B2%7D%7B4%7D+)
= 7 </span><span>
![\frac{1}{2}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B2%7D+)
5) 6:1 = </span><span>
![\frac{6}{1}](https://tex.z-dn.net/?f=+%5Cfrac%7B6%7D%7B1%7D+)
(=6)
6) 12:39 = </span><span>
![\frac{12}{39}](https://tex.z-dn.net/?f=+%5Cfrac%7B12%7D%7B39%7D+)
</span>
А) <span>43,98
б) </span>314,16<span>
в) </span><span>0,31</span>
3 * 4 : 2 = 6см² (если треугольник прямоугольный),
1)152:8=19(кг)
2)2500*19=47500(кг)
Ответ:47500 кг