Ответ №1
А)9/54+6/54=15/54
б)12/54+45/54=57/54=1 3/54
в)16/72+27/72=43/72
г)6/30+12/30=18/30=9/15
д)18/60+10/60=28/60=7/15
е)25/60+16/60=41/60
Ответ №2
A) 1/(2*3) + 1/(3*3) = (3+2)/(3*3*2) = 5/18
б) 2/(3*3) + 5/(2*3) = (2*2+5*3)/(3*3*2) = 19/18
в) 2/9 + 3/8 = (2*8+3*9)/(9*8) = 43/72
г) 2/(2*5) + 6/(3*5) = (2*3+6*2)/(2*3*5) = 18/30 = 3/5
д) (3*6+2*5)/(6*5*2) = 28/60 = 7/15
е) (5*5+4*4)/(3*4*5) = 41/60
ж) (3*9+2*5)/(2*2*9) = 37/36
з) (2*3+3*2)/(2*3*13) = 2/13
и) (3*7+2*5)/(17*3*2) = 31/102
к) 23/420
л) 54/900 = 27/450
м) 39/360 = 13/120
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