Question

Решите пожалуйста все 8 заданий 5×(1/5)2-16 1/59,3+7,82,1×3,5/4,919/2-6/514/25+3/29/4,5×2,5(13/21+3/14):10/27400×0,004×40

Answer 1

5×(1/5)2-16 1/5=2-16/5=-6/5=-1 1/5=-1,2

9,3+7,8=17,1

2,1×3,5/4,9=3/2=1,5

19/2-6/5=83/10=8,3

14/25+3/2=103/50=2,06

9/4,5×2,5 =5

(13/21+3/14):10/27=9/4=2,25

Answer 2

Для решения всех 8 заданий, давайте разберем их по порядку:

1. 5 × (1/5)^2 - 16 = 5 × (1/25) - 16 = 5/25 - 16 = 1/5 - 16 = -79/5

2. 1/5 + 9,3 + 7,8 × 2,1 × 3,5 ÷ 4,9 = 1/5 + 9.3 + 7.8 × 2.1 × 3.5 ÷ 4.9 = 1/5 + 9.3 + 36.54 ÷ 4.9 = 1/5 + 9.3 + 7.47 = 1/5 + 16.77 = 16.77 + 0.2 (1/5 as a decimal) = 16.97

3. (19/2) - (6/5) = (19/2) - (12/10) = (19/2) - (1/5) = (19/2) - (2/10) = (19/2) - (1/5) = (19/2) - 0.2 (1/5 as a decimal) = 18.3

4. (14/25) + (3/2) = 0.56 + 1.5 = 2.06

5. (13/21) + (3/14) ÷ (10/27) = (13/21) + (3/14) × (27/10) = (13/21) + (3/14) × (27/10) = (13/21) + (81/140) = (260/420) + (189/420) = (260 + 189) / 420 = 449 / 420 ≈ 1.069 (rounded to three decimal places)

6. 400 × 0,004 × 40 = 400 × 0.004 × 40 = 1.6

7. 5 × 2.5 × (13/21 + 3/14) = 5 × 2.5 × (26/42 + 3/14) = 5 × 2.5 × (26/42 + 9/42) = 5 × 2.5 × (35/42) = 5 × 2.5 × (5/6) = 5 × 2.5 × 5/6 = 62.5/6 ≈ 10.417 (rounded to three decimal places)

8. (10/27) ÷ (4.5/2.5) × (13/21 + 3/14) = (10/27) ÷ (9/5) × (13/21 + 3/14) = (10/27) × (5/9) × (13/21 + 3/14) = (50/243) × (13/21 + 3/14) = (50/243) × (182/294 + 39/294) = (50/243) × (221/294) = 11050/71742 ≈ 0.154 (rounded to three decimal places)

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