Question

0,8(3х-14)-0,6(6х-8)при х= -3 1/12

Answer 1

Ответ:

Пошаговое объяснение:

0,8(3х-14)-0,6(6х-8)=2,4х-11,4-3,6х+4,8=-1,2х-6,4

-1,2*(-37/12)-6,4=-101/10=-10,1

Answer 2

To find the value of the expression 0.8(3x-14) - 0.6(6x-8) when x = -3 1/12, we'll substitute this value into the expression and simplify it.

First, let's simplify the expression using the given value of x:

0.8(3x-14) - 0.6(6x-8)

Plugging in x = -3 1/12:

0.8(3(-3 1/12) - 14) - 0.6(6(-3 1/12) - 8)

To simplify further, we need to convert the mixed number -3 1/12 to an improper fraction:

-3 1/12 = -(3 + 1/12) = -(36/12 + 1/12) = -(37/12)

Now, let's substitute x = -(37/12) into the expression:

0.8(3(-(37/12)) - 14) - 0.6(6(-(37/12)) - 8)

Next, we simplify the expressions inside the parentheses:

0.8(-37/4 - 14) - 0.6(6(-37/12) - 8)

Now, we simplify the expressions within the parentheses:

0.8(-37/4 - 56/4) - 0.6(-37/2 - 8)

Combining the terms:

0.8(-93/4) - 0.6(-61/2)

To simplify further, we multiply the numerators and denominators:

(-0.8 * 93)/(4) - (-0.6 * 61)/(2)

Now, we calculate the numerator and denominator:

(-74.4)/(4) - (-36.6)/(2)

Finally, we perform the division:

-18.6 - (-18.3)

When we subtract -18.3 from -18.6, we get:

-0.3

Therefore, the value of the expression 0.8(3x-14) - 0.6(6x-8) when x = -3 1/12 is -0.3.