3/20 • (7/12 -1/2 ) + 79/80
_______________________ =
13/24 : (7/12 + 1/2 ) - 1/4
_______________________ =
13/24 : (7/12 + 1/2 ) - 1/4
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Answers & Comments
3/20×1/12=1/80
1/80+79/80=80/80=1
7/12+1/2=7/12+6/12=13/12
13/24÷13/12=13/24×12/13=1/2
1/2-1/4=2/4-1/4=1/4
1÷1/4=1×4/1=4
ответ 4