Question

a) 3,4x + 1,6 - 2,8x - 2,8; b) -3 1/2 y· 4x; c) 5 (1,8x + 1,2) - 12.​ преобразуйте выражение тождественно равные

Answer 1

Пошаговое объяснение:

а)

3,4х + 1,6 - 2,8х - 2,8 =

(3,4х - 2,8х) + (1,6 - 2,8) =

0,6х + (-1,2) = 0,6х - 1,2

б)

-3 1/2у * 4х =

(-3 1/2 * 4) * у * х = (-7/2 * 4) * у * х =

-28/2 * у * х = -14ху

с)

(1,8х + 1,2) - 12 = 1,8х + 1,2 - 12 = 1,8х - 10,8

Answer 2

a) 3.4x + 1.6 - 2.8x - 2.8

To simplify this expression, we combine like terms:

3.4x - 2.8x + 1.6 - 2.8

Now, let's subtract the x terms and combine the constant terms:

(3.4x - 2.8x) + (1.6 - 2.8) = 0.6x + (-1.2) = 0.6x - 1.2

So, the simplified expression is 0.6x - 1.2.

b) -3 1/2 y · 4x

To simplify this expression, we multiply the coefficients and combine like terms:

-3 1/2 y · 4x

First, we convert the mixed number -3 1/2 to an improper fraction: -3 1/2 = -7/2

Now, let's multiply the coefficients and combine the variables:

(-7/2) y · 4x = -7/2 * 4xy = -14xy

So, the simplified expression is -14xy.

c) 5 (1.8x + 1.2) - 12

To simplify this expression, we distribute the 5 to the terms inside the parentheses:

5 * 1.8x + 5 * 1.2 - 12

Now, let's multiply and combine the terms:

9x + 6 - 12 = 9x - 6

So, the simplified expression is 9x - 6.