Question

44,2b-(15,7b+23,45)при b=0,9и при b=17

Answer 1

44,2×0,9-(15,7×0,9+23,45)
39,78-(14,13+23,45)
39,78-37,75=2,03


44,2×17-(15,7×17+23,45)
751,4-(266,9+23,45)
751,4-290,35=461,05

Answer 2

To calculate the expression 44.2b - (15.7b + 23.45) for the given values of b, which are b = 0.9 and b = 17, we can substitute the values and perform the calculations.

1. For b = 0.9: 44.2(0.9) - (15.7(0.9) + 23.45)

First, we calculate the inner parentheses: 15.7(0.9) = 14.13

Now, substitute the calculated value into the expression: 44.2(0.9) - (14.13 + 23.45)

Multiply 44.2 by 0.9: 39.78 - (14.13 + 23.45)

Perform the addition within the parentheses: 39.78 - 37.58

Finally, subtract 37.58 from 39.78: 2.2

Therefore, for b = 0.9, the result is 2.2.

2. For b = 17: 44.2(17) - (15.7(17) + 23.45)

First, calculate the inner parentheses: 15.7(17) = 266.9

Now, substitute the calculated value into the expression: 44.2(17) - (266.9 + 23.45)

Multiply 44.2 by 17: 750.6 - (266.9 + 23.45)

Perform the addition within the parentheses: 750.6 - 290.35

Finally, subtract 290.35 from 750.6: 460.25

Therefore, for b = 17, the result is 460.25.