Question

1 найдите значение выражения (2,5-2 1/3)*(-5 1/7)+1 1/3:(-5,6)​

Answer 1

Ответ:

-1 2/21

Пошаговое объяснение:

(2,5-2 1/3)·(-5 1/7)+1 1/3÷(-5,6)=-1 2/21

1. 2,5-2 1/3=2 1/2-2 1/3=2 3/6-2 2/6=1/6

2. 1/6 ·(-5 1/7)=1/6 ·(-36/7)=-6/7

3. 1 1/3÷(-5,6)=4/3 ÷(-28/5)=4/3 ·(-5/28)=-5/(3·7)=-5/21

4. -6/7 -5/21=-18/21 -5/21=-23/21=-1 2/21

Answer 2

Ответ:

Пошаговое объяснение:

1) 2,5 - 2. 1/3 = 2. 5/10 - 2. 1/3 = 2. 15/30 - 2. 10/30 = 5/30 = 1/6

2) 1/6 * (-5. 1/7) = 1/6 * (-36/7) = 1/1 * (-6/7) = -6/7

3) 1. 1/3 : (-5,6) = 1. 1/3 : (-5. 6/10) = 4/3 : (-56/10) = 4/3 * (-10/56) = 1/3 * (-10/14) = -10/42 = -5/21

4) -6/7 + (-5/21) = -6/7 - 5/21 = -18/21 - 5/21 = -23/21 = -1. 2/21