Question

$frac{0.4+8*(5-0.8*frac{5}{8})-5:2frac{1}{2}}{(1frac{7}{8}*8-(8,9-2,6:frac{2}{3}))*34frac{2}{5}}$

Answer 1

                   8       5

0.8*5/8 = ----- * ---- =5/10 =0.5

                  10      8

 

5:2.5 = 2

 

числитель = 0.4 +8*(5-0.5) - 2 =0.4 + 36 -2 = 34.4

 

(1+7/8)*8 = 8 +7 =15

 

2.6: (2/3) = 2.6* 3/2 = 3.9

 

знаменаталь = (15 - (8.9 - 3.9))*34.4 = (15-5)*34.4 = 10*34.4

 

дробь=34.4/(10*34.4) = 1/10 = 0.1