Question

Розкрийте дужки та спростіть вираз: 1)(а+6)*2,4+1,3 2) 2,5(3-х)+2(х+5)

Answer 1

Ответ:

1) 2,4а + 15,7

2) 17,5 - 0,5х

Объяснение:

1) ( а + 6 ) * 2,4 + 1,3 =

= 2,4 * а + 2,4 * 6 + 1,3 =

= 2,4а + 14,4 + 1,3 =

= 2,4а + 15,7

2) 2,5 ( 3 - х ) + 2 ( х + 5 ) =

= 2,5 * 3 - 2,5 * х + 2 * х + 2 * 5 =

= 7,5 - 2,5х + 2х + 10 =

= 17,5 - 0,5х

Answer 2

1. (а + 6) * 2.4 + 1.3

To simplify the expression, we need to apply the distributive property and perform the multiplication:

(а + 6) * 2.4 = 2.4 * а + 2.4 * 6 = 2.4а + 14.4

Now, we can rewrite the expression:

(а + 6) * 2.4 + 1.3 = 2.4а + 14.4 + 1.3 = 2.4а + 15.7

Therefore, the simplified expression is 2.4а + 15.7.

2. 2.5(3 - х) + 2(х + 5)

First, let's apply the distributive property:

2.5 * (3 - х) = 7.5 - 2.5х

2 * (х + 5) = 2х + 10

Now, we can rewrite the expression:

2.5(3 - х) + 2(х + 5) = 7.5 - 2.5х + 2х + 10

Next, we can combine like terms:

-2.5х + 2х = -0.5х

7.5 + 10 = 17.5

Finally, we have:

2.5(3 - х) + 2(х + 5) = -0.5х + 17.5

Therefore, the simplified expression is -0.5х + 17.5.