Question

3/20*(7/12-1/2)+79/80
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13/24:(7/12+1/2)-1/4

Answer 1

3/20*(7/12-1/2)+79/80=3/20*(7/12-6/12)+79/80=3/20*1/12+79/80=1/80+79/80=1 
13/24:(7/12+1/2)-1/4=13/24:(7/12+6/12)-1/4=13/24*12/13-1/4=1/2-1/4=2/4-1/4=1/4