Question

Упростите выражение:4+0,2*(3-х)-0,5*(2х+5)Чему равно его значение при х=10?

Answer 1

4+0.2*(3-x)-0.5*(2x+5)

(раскрываем скобки)

4+0.6-0.2x-x+2.5

Если x=10 , то 4+0.6-0.2*10-10+2.5=2.6+2.5-10=

=-4.9

Ответ: -4.9

 

Answer 2

Simplifying the Expression

To simplify the expression 4 + 0.2*(3-x) - 0.5*(2x+5), we can follow these steps:

1. Distribute the constants inside the parentheses. 2. Combine like terms.

Let's simplify the expression step by step.

1. Distribute the constants inside the parentheses: - 4 + 0.2*(3-x) - 0.5*(2x+5) - 4 + 0.6 - 0.2x - 0.5*2x - 0.5*5

2. Combine like terms: - 4 + 0.6 - 0.2x - x - 2.5 - 2.5 - (4 + 0.6 - 2.5 - 2.5) - (0.2x + x) - -0.4 - 3.7x

So, the simplified expression is -0.4 - 3.7x.

Finding the Value for x=10

Now, let's find the value of the expression when x=10: - -0.4 - 3.7(10) - -0.4 - 37 - -37.4

Therefore, the value of the expression 4 + 0.2*(3-x) - 0.5*(2x+5) when x=10 is -37.4.