Question

(3/4 - 4/5) * 7,8 - (2/3 + 4/7) * (-7/13)= пожалуйста решите!!!!

Answer 1

Ответ:

83/300

Пошаговое объяснение:

(3/4 - 4/5) * 7,8 - (2/3 + 4/7) * (-7/13) =

= (15/20 - 16/20) * 78/10 - (14/21 + 12/21) * (-7/13) =

= -1/20 * 78/10 + 26/21 * 7/13 =

= -39/100 + 2/3 = -117/300 + 200/300 = 83/300

Answer 2

Sure, let's solve the expression step by step:

Step 1: Simplify the expressions within the parentheses. (3/4 - 4/5) * 7.8 = (15/20 - 16/20) * 7.8 = (-1/20) * 7.8 = -7.8/20

(2/3 + 4/7) * (-7/13) = ((14/21) + (12/21)) * (-7/13) = (26/21) * (-7/13) = -182/273

Step 2: Now, let's calculate the final result. -7.8/20 - (-182/273) = -7.8/20 + 182/273

To add fractions, they need to have a common denominator. The common denominator for 20 and 273 is 2730 (20 * 273 = 2730). Let's convert both fractions to have a common denominator:

-7.8/20 = (-7.8 * 273) / (20 * 273) = -2129.4 / 2730 182/273 = (182 * 10) / (273 * 10) = 1820 / 2730

Now, we can add the fractions:

-2129.4 / 2730 + 1820 / 2730 = (-2129.4 + 1820) / 2730 = -309.4 / 2730

The final result is: -309.4 / 2730. If you want to simplify the fraction further, you can divide both the numerator and denominator by their greatest common divisor (GCD). In this case, the GCD is 1, so the fraction is already simplified.

Therefore, the final result is approximately -0.1134.