Question

-21+98:7=;5/22*(7/10-3/20)=; -3,7-5,5*2,4=; -45+12*8=;9/10*(11/12-2/9)=;

Answer 1

Ответ:

Пошаговое объяснение:

- 21 + 98 / 7 = - 21 + 14 = - 7

5 / 22 * (7 / 10 - 3 / 20) = (5 / 22) * (7 / 10) - (5 / 22) * (3 / 20) = 35 / 220 - 15 / 440 = (70 - 15) / 440 = 55 / 440 = 1 / 8 = 0,125

- 3,7 - 5,5 * 2,4 = - 3,7 - 13,2 = - 16,9

- 45 + 12 * 8 = - 45 + 96 = 51

9 / 10 * (11 / 12 - 2 / 9) = (9 / 10) * (11 / 12) - (9 / 10) * (2 / 9) = 99 / 120 - 18 / 90 = (297 - 72) / 360 = 225 / 360 = 5 / 8 = 0,625

Answer 2

Let's solve each of these mathematical expressions step by step:

1. -21 + 98 ÷ 7 First, calculate the division: 98 ÷ 7 = 14 Now, subtract 21 from 14: -21 + 14 = -7

2. 5/22 * (7/10 - 3/20) First, simplify the subtraction inside the parentheses: 7/10 - 3/20 = 14/20 - 3/20 = 11/20 Now, multiply by 5/22: (5/22) * (11/20) To multiply fractions, multiply the numerators and denominators separately: (5 * 11) / (22 * 20) = 55/440 Simplify the fraction by dividing both the numerator and denominator by their greatest common divisor (5): (55 ÷ 5) / (440 ÷ 5) = 11/88

3. -3.7 - 5.5 * 2.4 Multiply 5.5 by 2.4: 5.5 * 2.4 = 13.2 Now, subtract 13.2 from -3.7: -3.7 - 13.2 = -16.9

4. -45 + 12 * 8 Multiply 12 by 8: 12 * 8 = 96 Now, add 96 to -45: -45 + 96 = 51

5. 9/10 * (11/12 - 2/9) First, simplify the subtraction inside the parentheses: 11/12 - 2/9 = 33/36 - 8/36 = 25/36 Now, multiply by 9/10: (9/10) * (25/36) To multiply fractions, multiply the numerators and denominators separately: (9 * 25) / (10 * 36) = 225/360 Simplify the fraction by dividing both the numerator and denominator by their greatest common divisor (5): (225 ÷ 5) / (360 ÷ 5) = 45/72 Further simplify the fraction by dividing both the numerator and denominator by their greatest common divisor (9): (45 ÷ 9) / (72 ÷ 9) = 5/8

So, the results are:

1. -7
2. 11/88
3. -16.9
4. 51
5. 5/8