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А) 48 * (5/17 + 12/17) = 48 * 1 = 48
В) 11/13 * (11/15 + 2/15) =11/13 * 13/15 =11/15
Б) 55 * (7/11 - 6/11) = 55 * 1/11 = 5
Г) 12/19 * (23/15 - 4/15) = 12/19 * 19/15 = 12/15
Д) 5/14 * (22/21 + 20/21) = 5/14 * 2 = 5/7
Е) 1/2 * (47/11 - 25/11) = 1/2 * 2 = 1

В)

А)=240/17 + 576/17 =48
Б)=5*7-5*6=35-30=5
В)=121/195 + 22/195 = 11/15
Г)=4/19 * 23/5 - 4/19 * 4/5 =92/95 - 16/95 =4/5
Д)=11/21 * 5/7 + 10/21 * 5/7 =55/147 + 50/147=5/7
Е)=47/22 - 25/22 =1