Question

Решите № 1329! СОКРАТИТЕ ( ни как не могу понять как это делать)

Answer 1

1) (12*35*72)/(25*54*28) = (12*7*72)/(5*54*28) = (12*72)/(5*54*4)= (3*72)/(5*54) = (3*8)/(5*6) = (8)/(5*2) = 4/5;

2) (62*5 + 62+15) / (31*35 + 31*15) = (62*(5 + 15)) / (31*(35 - 15)) = (62*20)/(31*20) = 62/31 = 2;

3) (5a+6a+7a)/(24a - 15a) = 18a / 9a = 2;

Answer 2

1. $\frac{12*35*72}{25*54*28}= \frac{12*7*72}{5*54*28}=\frac{12*1*72}{25*54*4}=\frac{3*1*72}{25*54*1}=\frac{3*1*8}{25*6*1}= \\ \\ =\frac{1*1*8}{25*2*1}=\frac{1*1*4}{25*1*1}=\frac{4}{25}=\frac{16}{100}=0.16$

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