Question

-4(3.5x-4)-(7-2.1x)+5(0.3x-5) приx=-10/27

Answer 1

-4(3.5x-4)-(7-2.1x)+5(0.3x-5)=-14х+16-7+2,1х+1,5х-25=-10,4х-16=-10,4*(-10/27)-16=-104/10*(-10/27)-16=3 23/27-16=12 4/27

Answer 2

To evaluate the expression -4(3.5x - 4) - (7 - 2.1x) + 5(0.3x - 5) when x = -10/27, follow these steps:

Step 1: Substitute the value of x into the expression: Replace x with -10/27 in the expression:

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

Step 2: Perform the arithmetic calculations: Now, let's solve the expressions inside the parentheses and brackets:

-4(3.5 * (-10/27) - 4) = -4(-35/27 - 108/27) = -4(-143/27) = 572/27 -(7 - 2.1 * (-10/27)) = -(7 + 21/27) = -(211/27) = -211/27 5(0.3 * (-10/27) - 5) = 5(-3/27 - 135/27) = 5(-138/27) = -690/27

Now, we can rewrite the entire expression with these results:

= 572/27 - 211/27 - 690/27

Step 3: Combine the fractions: To combine the fractions, we need to find a common denominator, which is 27:

= (572 - 211 - 690)/27 = -329/27

The value of the expression when x = -10/27 is -329/27.