Question

-4*(3,5x-4)-(7-2.1X)+5(0.3-5)=???,если x= -10/27 даю 11 баллов,решите пожалуйста

Answer 1

Ответ:

-4*(3.5x-4)= -14x+16

-(7-2.1x)= -7+2.1x

5(0.3-5)= 1.5-25

-14x+16-7+2.1x+1.5-25= -11.9x-14.5

при x= -10

-11.9*-10-14.5= 119-14.5=104.5

при x=27

-11.9*27-14.5=-321.3-14.5=335.8

Пошаговое объяснение:

Answer 2

Sure, I'll be happy to help you solve the expression! Let's substitute the value of x into the given expression and simplify it step by step:

Given expression: -4*(3.5x - 4) - (7 - 2.1x) + 5(0.3 - 5)

Substitute x = -10/27:

-4 * (3.5 * (-10/27) - 4) - (7 - 2.1 * (-10/27)) + 5 * (0.3 - 5)

Now, perform the calculations step by step:

1. -4 * (3.5 * (-10/27) - 4) = -4 * (-35/27 - 4) = -4 * (-35/27 - 108/27) = -4 * (-143/27) = 572/27

2. -(7 - 2.1 * (-10/27)) = -(7 + 21/27) = -(189/27 + 21/27) = -210/27 = -70/9

3. 5 * (0.3 - 5) = 5 * (-4.7) = -23.5

Now, put everything together:

Result = 572/27 - 70/9 - 23.5

To add or subtract fractions, we need to find a common denominator:

The least common multiple of 27 and 9 is 27. So, we'll convert -70/9 to an equivalent fraction with a denominator of 27:

-70/9 = -70/9 * 3/3 = -210/27

Now the expression becomes:

Result = 572/27 - 210/27 - 23.5

Now we can combine the fractions:

Result = (572 - 210)/27 - 23.5 Result = 362/27 - 23.5

Now, to subtract a whole number from a fraction, we need to convert the whole number into a fraction with a denominator of 27:

23.5 = 23.5 * 27/27 = 635.5/27

Finally, the expression becomes:

Result = 362/27 - 635.5/27

Now, subtract the fractions:

Result = (362 - 635.5)/27 Result = -273.5/27

The simplified result is approximately -10.130.

So, when x = -10/27, the given expression evaluates to approximately -10.130.

I hope this helps! Let me know if you have any questions or if there's anything else I can assist you with.