Question

УПРОСТИТЕ ВЫРАЖЕНИЯ 11/9(3Х-9)-21/3(Х-1.8)и найдите его значение при х=0.75пожалуйста очень надо срочно

Answer 1

Ищишь общий знаменатель и решаешь

Answer 2

Simplifying the Expression

To simplify the given expression 11/9(3x-9)-21/3(x-1.8), we can follow the order of operations (PEMDAS/BODMAS) which stands for Parentheses/Brackets, Exponents/Orders, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).

First, we'll simplify the expression step by step.

1. Distribute the terms inside the parentheses/brackets: - 11/9(3x-9) becomes 11/3x - 11 - 21/3(x-1.8) becomes 7(x-1.8)

2. Substitute the simplified expressions back into the original expression: - The original expression becomes 11/3x - 11 - 7(x-1.8)

3. Combine like terms: - 11/3x - 11 - 7x + 12.6

4. Combine the constant terms: - -11 + 12.6 = 1.6

5. Combine the x terms: - 11/3x - 7x = -16/3x

So, the simplified expression is -16/3x + 1.6.

Finding the Value of the Expression at x = 0.75

Now, let's find the value of the simplified expression -16/3x + 1.6 when x = 0.75.

Substitute x = 0.75 into the expression: - (-16/3 * 0.75) + 1.6 - (-4 * 0.75) + 1.6 - (-3) + 1.6 - -1.4

So, the value of the expression at x = 0.75 is -1.4.