Question

Вычислите: в)17\36+13\72+11\18 г) 25\48-9\16-21\8 3. Найдите число n, если 4\7 от n равно 80% от 40. 4. Какова была первоначальная сумма на счете вклада, по которому выплачивается 4% годовых, если через год на счете оказалось 29328 руб. Даю 50 баллов за лучший ответ!

Answer 1

В)17\36+13\72+11\18=34/72+13/72+44/72=91/72=1  19/72

г) 25\48-9\16-21\8=25/48-27/48-126/48=-2/48-126/48=-128/48=-16/6=
=-8/3=-2 2/3
3.
Найдите число n, если 4\7 от n равно 80% от 40.
80/100*40=8*4=32
4/7* n=32
 n=32:4/7
 n=32*7/4=8*7=56

4.
Какова была первоначальная сумма на счете вклада, по которому выплачивается 4% годовых, если через год на счете оказалось 29328 руб.
х*(100+4)/100=29328
х*1,04=29328
х=29328/1,04
х=28200

Answer 2

Calculation of Expressions:

To calculate the given expressions, let's break them down step by step:

a) 17/36 + 13/72 + 11/18: To add fractions with different denominators, we need to find a common denominator. In this case, the common denominator is 72. Then, we can add the fractions together: 17/36 + 13/72 + 11/18 = (34/72) + (13/72) + (44/72) = 91/72.

b) 25/48 - 9/16 - 21/8 + 3: To subtract fractions with different denominators, we need to find a common denominator. In this case, the common denominator is 48. Then, we can subtract the fractions and add the whole number: 25/48 - 9/16 - 21/8 + 3 = (25/48) - (18/48) - (168/48) + 3 = -158/48 + 3 = -158/48 + 144/48 = -14/48 = -7/24.

Calculation of n:

To find the value of n, we need to solve the equation: 4/7 * n = 80% * 40.

First, let's convert 80% to a decimal by dividing it by 100: 80% = 80/100 = 0.8.

Now, we can rewrite the equation: 4/7 * n = 0.8 * 40.

To solve for n, we can multiply both sides of the equation by the reciprocal of 4/7, which is 7/4: n = (0.8 * 40) * (7/4) = 32 * (7/4) = 56.

Therefore, n is equal to 56.

Calculation of Initial Deposit Amount:

To find the initial deposit amount, we need to solve the equation: P + (4/100) * P = 29328.

Let P represent the initial deposit amount.

The equation can be rewritten as: P + (4/100) * P = 29328.

To simplify, we can factor out P: P * (1 + 4/100) = 29328.

Adding the fractions: P * (1 + 1/25) = 29328.

Finding a common denominator: P * (25/25 + 1/25) = 29328.

Simplifying: P * (26/25) = 29328.

Dividing both sides by (26/25): P = 29328 / (26/25) = 29328 * (25/26) = 28200.

Therefore, the initial deposit amount was 28200 rubles.

I hope this helps! Let me know if you have any further questions.