Предварительно сократив дроби,найдите значение выражения : 3/12+25/30, 10/24-21/54, 30/54+22/30, 28/40-10/75, 12/27+14/21, 14/24-15/40, 12/18-5/60, 4/24+3/36
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3/12+25/30=1/4+5/6=(3+10)/12=13/12=1_1/1210/24-21/54=5/12-7/18=(5*3-7*2)/36=(15-14)/36=1/36
30/54+22/30=5/9+11/15=(5*5+11*3)/45=(25+33)/45=58/45=1_13/45
28/40-10/75=7/10-2/15=(7*3-2*2)/30=(21-4)/30=17/30
12/27+14/21=4/9+2/3=(4+2*3)/9=(4+6)/9=10/9=1_1/9
14/24-15/40=7/12-3/8=(7*2-3*3)/24=(14-9)/24=5/24
12/18-5/60=2/3-1/12=(2*4-1)/12=(8-1)/12=7/12
4/24+3/36=1/6+1/12=(2+1)/12=3/12=14