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Simplify
100

2/7+4/7

6/7

100

8/12-3/12

5/12

100

2/5 xx 5/2

1

100

3/4 / 5/4

3/5

100

20/4

5

200

4/7+3/14

11/14

200

7/9-8/27

13/27

200

12/4 (1/3)

1

200

1/2 / 4/5

5/8

200

21/9

7/3

300

-2(5/2+3/2)

-8

300

3/5+(-1/4)

7/20

300

(2/3)(15/7)

10/7

300

6 / (2/5

15

300

(4(3))/(2-1)

12
400

1/2(2/3+1/6)

5/12

400

4/5(-5/4+3/5)

-13/25

400

7/9 (8/5)

56/45

400

12/(17/19)

228/17

400

-3(2/5)+1

-1/5

500

9 10/20 + 1 2/4

11

500

9 1/5-1 6/10

7 3/5 or 38/5

500

3 2/3 xx 4 1/5

15 2/5 or 77/5

500

(3/5)/7

3/35

500

(6(5+3/2))/(1/2

78