Question

2/3(2а-3)+1/2(7в+2) при а =3; в= 1 1/7

Answer 1

Ответ:

= 7

Пошаговое объяснение:

при а = 3; в = 1 1/7 = 8/7

2/3(2а - 3) + 1/2(7в + 2) = 2/3(2*3 - 3) + 1/2(7*8/7 + 2) =

2/3 * 3 + 1/2 * 10 = 6/3 + 10/2 = 2 + 5 = 7

Answer 2

To evaluate the expression 2/3(2a-3) + 1/2(7в+2) when a = 3 and в = 1 1/7, we simply substitute these values into the expression and perform the calculations. First, let's convert в = 1 1/7 to a mixed fraction:

в = 1 + 1/7 = 8/7

Now, let's substitute the values of a and в into the expression:

2/3(2 * 3 - 3) + 1/2(7 * 8/7 + 2)

Now, let's simplify each part of the expression:

2/3(6 - 3) + 1/2(56/7 + 2)

2/3 * 3 + 1/2 * (8 + 2)

2 + 1/2 * 10

2 + 5

Now, add the final results:

2 + 5 = 7

So, when a = 3 and в = 1 1/7, the expression 2/3(2a-3) + 1/2(7в+2) evaluates to 7.