Question

-2 1/7:0,25-1,9:(-0,1)-20/21:(-1 2/3)

Answer 1

Ответ:

$- 2 \frac{1}{7} \div 0.25 + 1.9 \div 0.1 + \frac{20}{21} \div 1 \frac{2}{3} = \\ = - \frac{15}{7} \frac{4}{1} + 19 + \frac{20}{21} \frac{3}{5} = \\ = \frac{ - 15 \times 4 + 19 \times 7 + 4}{7} = \\ = \frac{ - 60 + 133 + 4}{7} = \\ = \frac{77}{7} = 11$

Answer 2

Ответ:

11

Пошаговое объяснение:

1) -2 1/7 : 0,25 = -15/7 : 25/100 = -15/7 * 100/25 = -3/7 * 100/5 = -300/35 = -60/7 = -8 4/7

2) 1,9 : (-0,1) = -19

3) 20/21 : (-1 2/3) = 20/21 : (-5/3) = 20/21 * (-3/5) = 4/7 * (-1/1) = -4/7

4) -8 4/7 - (-19) = -8 4/7 + 19 = -8 4/7 + 18 7/7 = 10 3/7

5) 10 3/7 - (-4/7) = 10 3/7 + 4/7 = 10 7/7 = 11