Question

помогите решить срочно​

Answer 1

Ответ:

-25.5

Пошаговое объяснение:

1. $2\frac{1}{6} :1\frac{2}{3} = \frac{2*6+1}{6} :\frac{1*3+2}{3} = \frac{13}{6} : \frac{5}{3} =\frac{13}{6} *\frac{3}{5} = \frac{13*3}{6*5} =\frac{39}{30} = \frac{13}{10} = 1 \frac{3}{10} = 1.3$

2. $8\frac{1}{7}* 2\frac{4}{19} = \frac{8*7+1}{7} *\frac{2*19+4}{19} = \frac{57}{7} * \frac{42}{19}= \frac{57*42}{7*19} = \frac{2394}{133} = 18$

3. $18+8\frac{4}{5} = \frac{18}{1} + \frac{8*5+4}{5} =\frac{18}{1} +\frac{44}{5} = \frac{5*18}{5*1}+ \frac{1*44}{1*5} = \frac{90}{5} + \frac{44}{5} = \frac{90+44}{5} =\frac{134}{5} = 26\frac{4}{5} = 26.8$

4. 1.3 - 26.8 = -25.5