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