Question

9x(x - 2) - (3x + 5)(3x - 5) При х=1/18 (Расписать подробно)

Answer 1

9x(x - 2) - (3x + 5)(3x - 5) = 9х²-18х-(9х²-25)= 9х²-18х-9х²+25= 25-18х.

Если х= 1/18, то

25-18х= 25- 1/18×18= 25-1= 24.

ОТВЕТ: 24.

Answer 2

Ответ:

24

Пошаговое объяснение:

9х (х-2) - (3х+5) (3х-5) = 9х^2 - 18х - (9х^2 - 25) = 9х^ 2 - 18х -9х^2 + 25 = -18х + 25 = (-18)×(1/18) + 25 = (-1) + 25 = 24

Answer 3

To evaluate the expression 9x(x - 2) - (3x + 5)(3x - 5) when x = 1/18, we substitute the value of x into the expression and simplify step by step. Let's go through the process:

Step 1: Replace x with 1/18 in the expression: 9(1/18)((1/18) - 2) - (3(1/18) + 5)(3(1/18) - 5)

Step 2: Simplify the expression within each set of parentheses: (1/2)((1/18) - 2) - ((1/6) + 5)((1/6) - 5)

Step 3: Simplify the expression within each set of parentheses further: (1/2)((1/18) - 36/18) - ((1/6) + 5)((1/6) - 5)

Step 4: Perform the subtraction within the first set of parentheses: (1/2)(-35/18) - ((1/6) + 5)((1/6) - 5)

Step 5: Simplify the expression within each set of parentheses further: (1/2)(-35/18) - (7/6)((1/6) - 5)

Step 6: Perform the subtraction within the second set of parentheses: (1/2)(-35/18) - (7/6)(-29/6)

Step 7: Simplify the expression within the second set of parentheses further: (1/2)(-35/18) - (203/36)

Step 8: Multiply the fractions and perform the subtraction: (-35/36) - (203/36)

Step 9: Combine like terms: (-35 - 203)/36

Step 10: Simplify the expression: -238/36

Step 11: Reduce the fraction to lowest terms: -119/18

Therefore, when x = 1/18, the expression 9x(x - 2) - (3x + 5)(3x - 5) evaluates to -119/18.