Question

Обчисліть: 1) − 19/21 - 2/3 2) 51/64 - 9/16 3) 22/39 - 11/26 4) 17/20 - 13/25 Заранее спасибо)

Answer 1

19/21 - 2/3 = 19/21- 14/21= 5/21
51/64 - 9/16= 51/64 - 36/64= 15/64
22/39 - 11/26= 44/78 - 33/78 = 11/78

НСК(39,26)=3*2*13= 78
39/3 26/2
13/13 13/13
1/ 1/

17/20 - 13/25= 85/100 - 52/100= 33/100
НСК(20,25)=2*2*5*5= 100
20/2 25/5
10/2 5/5
5/5. 1/
1/

Answer 2

Звичайно! Розрахунки наведені нижче:

1. -19/21 - 2/3 = (-193)/(213) - (27)/(37) = -57/63 - 14/21 = (-57 - 14)/63 = -71/63

2. 51/64 - 9/16 = (512)/(642) - (94)/(164) = 102/128 - 36/64 = (102 - 36)/128 = 66/128

3. 22/39 - 11/26 = (222)/(392) - (113)/(263) = 44/78 - 33/78 = (44 - 33)/78 = 11/78

4. 17/20 - 13/25 = (175)/(205) - (134)/(254) = 85/100 - 52/100 = (85 - 52)/100 = 33/100

Отже, результати обчислень:

1. -71/63
2. 33/64
3. 11/78
4. 33/100