2 3 4 3 1 8 5 4 2 3 11 12

2.3/4 – [3.1/8 ÷ {5 – (4.2/3 – 11/12)}]

Answers:

2.3/4 – [3.1/8 ÷ {5 – (4.2/3 – 11/12)}]

= 11/4 – [25/8 ÷ {5 – (14/3 – 11/12)}]

= 11/4 = [25/8 ÷ {5 – (56 – 11)/12}]

= 11/4 – [25/8 ÷ {5 – 45/12}]

= 11/4 – [25/8 ÷ {(60 – 45)/12}]

= 11/4 – [25/8 ÷ 15/12]

= 11/4 – [25/8 × 12/15]

= 11/4 – 5/2

= (11 – 10)/4

= ¼