24 номер сократите дробь:

1) $\frac{7,8*2,7}{9*0,3*3,9} = \frac{1*2,7}{9*0,3*2} =\frac{2,7}{9*0,3*2} =\frac{9}{9*1*2} =\frac{9}{9*2} = \\ \frac{1}{1*2} =1/2=0,5$

2) $\frac{8a+16a}{2*8a} = \frac{24a}{16a} =24/16=3/2=1.5$

3) $\frac{31*90-35*31}{35*31}= \frac{31(90-35)}{35*31}= \frac{90-35}{35}= 55/35=11/7=1 \frac{4}{7}$

4) $\frac{57x+19x}{19x*4} = \frac{19x(3+1)}{19x*4} =\frac{4}{4} =1$