Question

Даю 20 баллов помогите быстрее !

Answer 1

$\frac{8}{5} \div \frac{16}{25} - 7 \times \frac{1}{4} + 2 \times \frac{5}{8} \times \frac{10}{7} = \frac{8}{5} \times \frac{25}{16} - \frac{29}{4} + \frac{21}{8} \times \frac{10}{7} = \frac{5}{2} - \frac{29}{4} + \frac{3 \times 5}{4} = \frac{5 \times 2 - 29 + 15}{4} = \frac{ - 4}{4} = - 1$

Answer 2

Ответ:

1) -1; 2) 2 1/3; 3) -4;

Пошаговое объяснение:

1) 8/5:16/25-7 1/4+2 5/8*10/7=

8/5*25/16-7 1/4+21/8*10/7=

(8*5)/16-29/4+15/4=40/16-29/4+15/4=

(40-116+60)/16=-16/16=-1

2) 16/15:2/5-6 1/3+2 1/12*4/5=

16/15*5/2-6/3+25/12*4/5=8/3-6/3+5/3=

(8-6+5)/3=7/3=2 1/3

3) 14/15:8/45-10 1/2+2 3/16*4/7=

14/15*45/8-10 1/2+35/16*4/7=

+21/4-21/2+5/4=(21-42+5)/4=-16/4=-4