Question

Oblicz, zamieniając na ułamki zwykle (pamiętaj o skracaniu)





1. 5 + 2/3 =

2. 1,8 - 1 2/3 =

3. 2,5 x 2 2/7 =

4. 2 1/4 : 0,3 =

5. 3,75 : ( 2 5/6 + 1 1/3) =

6. 12 : 3/5 - 1 1/3 x 0,3 =

7. (1/2)do potęgi drugiej + 5 1/3 x 1,5 =

8. 20 - 12 2/3 : 5/6 =

Answer 1

1. 5 + 2/3 = 5/1 + 2/3 = 15/3 + 2/3 = 17/3 =  5 i 2/3

2. 1,8 - 1 2/3 =  9/5 - 5/3  =  27/15 -  25/15  = 2/15 

3. 2,5 x 2 2/7 =   5/2 x 16/7  = 80/14 = 40/7 =  5 i 5/7

4. 2 1/4 : 0,3 =  9/4 : 3/10 = 9/4 * 10/3 = 90/12 = 15/2 = 7 i 1/2

5. 3,75 : ( 2 5/6 + 1 1/3) =  15/4 : ( 17/6 + 4/3) =   15/4 : ( 17/6 + 8/6) =  15/4 : 25/6 = 15/4 * 6/25 = 90/100 = 9/10

6. 12 : 3/5 - 1 1/3 x 0,3 =  12/1 : 3/5 - 4/3 * 3/10 =  12/1 * 5/3 - 4/3 * 3/10 = 60/3 - 12/30 = 20/1 - 2/5 = 100/5 - 2/5 =  98/5 =  19 i 3/5

7. (1/2)^2+ 5 1/3 x 1,5 =   1/4 + 16/3 x 3/2 =    1/4 +  48/6 =  1/4 +  8/1 = 1/4 + 32/4 = 33/4 = 8 i 1/4

8. 20 - 12 2/3 : 5/6 =  20/1 - 38/3 : 5/6  =   20/1 - 38/3 * 6/5 =  20/1 - 76/5 = 100/5 - 76/5 = 24/5 = 4 i 4/5 = 4,8