Question

-2 6/7•(2 1/5-2, 9) =

Answer 1

Ответ:

2

Пошаговое объяснение:

-2 6/7 * (2 1/5 - 2,9)=

1) 2 1/5 = 2 1*2/(2*5) = 2 2/10 = 2,2

2,2 - 2,9 = - 0,7

2) - 2 6/7= -(2*7+6)/7 = -(14+6)/7 = -20/7

-0,7 = -7/10

-2 6/7 * (-0,7) = -(20/7) * (-7/10)=

= (-1) * (-1) * (20*7) / (7*10)=1*2=2

Answer 2

To solve the expression, let's break it down step by step:

1. Convert the mixed numbers to improper fractions:

   • 2 6/7 = 20/7
   • 2 1/5 = 11/5
   • 2 9/10 = 29/10

2. Perform the subtraction inside the parentheses: 11/5 - 29/10 = (22/10) - (29/10) = -7/10

3. Now multiply the result from step 2 by 20/7: -2 * (-7/10) = 14/10 = 7/5

So, the value of the expression is 7/5.