Question

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Answer 1

1. 1/3

2. 2/7

1. a+b+c _ a-b+c

2 2

1/2+1/3+1/5 _ 1/2-1/3+1/5

2 2

15+10+6 15-10+6

_30_ _ _30_

2 2

31 11

30 _ 30

2 2

31 x 1 _ 11 x 1

30 2 30 2

31 _ 11

60 60

1

3

2. 4a+10

3b-5

4(-3)+10

3(4)-5

-12+10

12-5

_ 2

7