3 3/7:1 5/11 - 26/49 * 1/52

3 цел 3/7:1 цел 5/11-26/49*2 цел 1/52=5ц3/14 1)3 цел 3/7:1 цел 5/11=24/7:16/11=24/7*11/6=264/42=6ц12/42=6ц2*6/7*6=6ц2/7 2) 26/49*2 цел 1/52=26/49*105/52=26*105/49*52=26*7*15/7*7*2*26=15/7*2=15/14= =1ц1/14 3) 6ц2/7-1ц1/14=(6-1)+(2/7-1/14)=5+(2*2/7*2-1/14)=5+(4/14-1/14)=5+(4-1/14)= =5+3/14=5ц3/14 удачи!