Question

18*(1/9)²-20*1/9 как это решать подробно

Answer 1

18*1/81-20/9=
2*1/9-20/9=
2/9-20/9=
-2

Answer 2

Calculation Explanation

To solve the expression 18*(1/9)² - 20*(1/9), we can follow the order of operations (PEMDAS/BODMAS) to simplify the expression step by step.

1. First, we need to calculate the square of (1/9), which is (1/9)². This can be done by multiplying (1/9) by itself: (1/9) * (1/9) = 1/81.

2. Next, we substitute the value of (1/9)² back into the original expression: 18 * (1/81) - 20 * (1/9).

3. Now, we can simplify the expression further by performing the multiplications: 18/81 - 20/9.

4. To subtract the fractions, we need a common denominator. The least common multiple of 81 and 9 is 81. So, we can rewrite the expression as: (18/81) - (20/9) = (18 - 180)/81 = -162/81.

5. Finally, we can simplify the fraction by dividing both the numerator and denominator by their greatest common divisor, which is 81: -162/81 = -2.

Therefore, the solution to the expression 18*(1/9)² - 20*(1/9) is -2.

Calculation Steps

1. (1/9)² = 1/81 [[1]](https://uchi.ru/otvety/questions/naydite-znachenie-virazheniya-18-1-9-2-20-1-9). 2. 18 * (1/81) - 20 * (1/9) = 18/81 - 20/9. 3. 18/81 - 20/9 = (18 - 180)/81 = -162/81 = -2.

So, the solution is -2.