Question

помогите решить пожалуйста

Answer 1

$frac{(2.5 - frac{7.5}{5}) times 0.5 }{(2 - 1.8) div 0.4} + frac{(6 frac{3}{5} - 3 frac{3}{14} ) times 5 frac{5}{6} }{(21 - 1.25) div 2.5} = frac{(2.5 - 1.5) times 0.5}{0.2 div 0.4} + frac{( frac{33}{5} - frac{45}{14}) times frac{35}{6} }{19.75 div 2.5} = frac{1 times 0.5}{0.5} + frac{( frac{462}{70} - frac{225}{70} ) times frac{35}{6} }{19 frac{3}{4} div frac{5}{2} } = 1 + frac{ frac{237}{70} times frac{35}{6} }{ frac{79}{4} times frac{2}{5} } = 1 + frac{ frac{79 times 1}{2 times 2} }{ frac{79 times 1}{2 times 5} } = 1 + frac{79}{4} div frac{79}{10} = 1 + frac{79}{4} times frac{10}{79} = 1 + frac{10}{4} = 1 + 2.5 = 3.5$

Answer 2

1)7,5/5=1,5

2)2,5-1,5=1

3)1*0,5=0,5

4)2-1,8=0,2

5)0,2/0,4=0,5

6)0,5/0,5=1

7)(6 3/5)-(3 3/14)=(6*5+3)/5-(3*14+3)/14=33/5-45/14=462/70-225/70=237/70

8)(237/70)*(5 5/6)=(237/70)*(35/6)=79/4

9)21-1,25=19,75

10)19,75/2,5=1975/250=7,9=79/10

11)(79/4)/(79/10)=10/4=5/2=2,5

12)1+2,5=3,5

ответ:3,5