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1.a.

3 1/3 - 2 5/6 =

= 10/3 - 17/6

= 20/6 - 17/6

= 3/6 = 1/2

1.b.

1/2 * 3 1/3 + 1/2 * 2 5/6 =

= 1/2 * 10/3 + 1/2 *17/6

= 10/6 + 17/12

= 20/12 + 17/12

= 37/12

= 3 1/12

2.a.

2 1/3 - 1 1/2 =

= 7/3 - 3/2

= 14/6 - 9/6

= 5/6

2.b.

1/12 * 5/6 = 5/72

3.

3 3/8 * 3 =

= 27/8 * 3/1

= 81/8

= 10 1/8

4.

6 1/4 - 5 1/2 =

= 25/4 - 11/2

= 25/4 - 22/4

= 3/4

(3/4)/(6 1/4) =

= (3/4)/(25/4)

= 3/4 * 4/25

= 3/25