а)4/7*5/24:1 1/14 б)25*7/15:7/9 в)7/18:20/21:5/12 г) 5/9*2 1/4:20

а.4/7 * 5/24 : 1 1/14= 5/42 : 15/14 = 5/42*14/15=1/9б.25*7/15 : 7/9=35/3 : 7/9=35/3 * 9/7=15в. 7/18 : 20/ 21/: 5/12=7/18*21/20*12/5=49/120*12/5=49/50г.5/9*2  1/4:20=5/9 * 9/4:20=5/4 :20=1/16

а.4/7 * 5/24 : 1 1/14= 5/42 : 15/14 = 5/42*14/15=1/9б.25*7/15 : 7/9=35/3 : 7/9=35/3 * 9/7=15в. 7/18 : 20/ 21/: 5/12=7/18*21/20*12/5=49/120*12/5=49/50г.5/9*2  1/4:20=5/9 * 9/4:20=5/4 :20=1/16