Вычислите: 5/9+2/3

1/12+3/4

1/2+3/8

17/1000+81/100

11/16-3/8

5/6-5/12

4/7-8/21

17/30-4/15

/ (означает дробную черту)

1. 11/9

2. 5/6

3. 7/8

4. 827/1000

5. 5/16

6. 5/12

7. 4/21

8. 3/10

(5/9) + (2/3) = (5+2*3) / 9=11/9=1 (2/9)

(1/12) + (3/4) = (1+3*3) / 12=10/12=5/6

(17/1000) + (81/100) = (17+81*10) / 1000=827/1000=0,827

(11/16) - (3/8) = (11-3*2) / 16=5/16

(5/6) - (5/12) = (5*2-5) / 12=5/12

(4/7) - (8/21) = (4*3-8) / 21=4/21

(17/30) - (4/15) = (17-4*2) / 30=9/30=3/10=0,3