Question

Сократите:
1) 12×35×72
25×54×28
2) 62×5+62×15
31×35-31×15
3) 5а+6а+7а
24а-15а

Answer 1

1)  $\large \boldsymbol { \frac{12*35*72}{25*54*28}=\frac{4*3*5*7*4*18}{5*5*3*18*7*4}=\frac{4}{5}}$

2) $\large \boldsymbol {\frac{62*5+62*15}{31*35-31*15} =\frac{62*(5+15)}{31*(35-15)} =\frac{62*20}{31*20} =2}$

3) $\large \boldsymbol {\frac{5a+6a+7a}{24a-15a} =\frac{18a}{9a} =2}$