А)=(14/30+7/30+24/30)/(2-2/6-3/6)=(45/30)/1 1/6)=(45/30)/ (7/6) = 45/30 х 6/7 =45/5 х 1/7 = 45/7 = 6 3/7
б) = (5/30+3/30+ 2/30)/ (36/60-20/30-15/60)=(10/30) /(1/60)=10/30 х 60/1 = 10/1 х 2/1 = 20
112-а/30-64/30=108
-а/30=108-112+64/30
-а/30=-4+64/30
-а/30=(-120+64)/30=-56/30
-а/30=-56/30
а=(56*30)/30
а=56
Y : 3 1/5 = 4 1/2 : 2 1/4
y : 16/5 = 9/2 : 9/4
y : 16/5 = 2
y = 16/5 • 2
y = 32/5
y = 6 2/5
2,3у + 1,3у = 38 - 11;
3,6 у = 27
у = 27: 3,6 = 27/1 : 36/10 = 27/1 * 10/36 = 15/2 = 7,5