х : 7,5 = 6/17 х=6/17 * 7,5 = 6/17 * 75/10 = 6/17 * 15/2 = (3*15)/(17*1) =45/17х= 2 11/17проверим:2 11/17 : 7,5 = 6/1745/17 * 10/75 = 6/1745/17 * 2/15 = 6/17(3*2)/(17*1) = 6/176/17=6/179 2/11 * х = 10,1101/11 * х = 101/10х= 101/10 : 101/11 = 101/10 * 11/101 = 11/10х= 1,1проверим:9 2/11 * 1,1 = 10,1101/11 * 11/10 = 10,1101/10 = 10,110,1=101у - 9,7 = 8 2/3у= 8 2/3 + 9,7 = 26/3 + 97/10 = (260+291)/30 = 551/30 у= 18 11/30проверим:18 11/30 - 9,7 = 8 2/3551/30 - 291/30 = 8 2/3260/30 = 8 2/326/3 = 8 2/38 2/3 = 8 2/3100,3 + х = 102 1/6х= 102 1/6 - 100,3 = 102 5/30 - 100 9/30 = 101 35/30 - 100 9/30х= 1 26/30 проверим:100,3 + 1 26/30 = 102 1/6100 3/10 + 1 26/30 = 102 1/6100 9/30 + 1 26/30 = 102 1/6101 + 35/30 = 102 1/6101 + 7/6 = 102 1/6102 1/6 = 102 1/6