a. -1/4 . 1/3 . 3/11 b. 25/14 . 3/-8 .-2/15 c. 5/-2 . -9/5 . 12/81 d. -9/11 ÷ 28/5 . 2/9

a) -1/4 . 1/3 . 3/11

= -1/12 . -1/44

= 1/528

b) 25/14 . 3/-8 . -2/15

= -75/112 . -2/15

= 5/56

c) 5/-2 . -9/5 . 12/81

= 9/2 . 12/81

= 2/3

d) -9/11 : 28/5 . 2/9

= -9/11 . 5/28 . 2/9

= -45/308 . 2/9

= -5/154