Question

7(3-4b) - 5(38+4) при b= 0,2​

Answer 1

Пошаговое объяснение:

7(3-4*0,2)-5(38+4)

7(3-0,8)-5*42

7*2,2-210

15,4-210

-194,6

Answer 2

To evaluate the expression $7(3-4b) - 5(38+4)$ when $b = 0.2$, you can substitute $b$ with the given value and then perform the arithmetic operations. Here's the step-by-step calculation:

$7(3 - 4 \cdot 0.2) - 5(38 + 4)$

$= 7(3 - 0.8) - 5(42)$

$= 7 \cdot 2.2 - 5 \cdot 42$

$= 15.4 - 210$

Now, subtract 210 from 15.4:

$= -194.6$

Therefore, $7(3-4b) - 5(38+4)$ when $b = 0.2$ is $-194.6$.