У-59/11=19-48/11-65/11
y-59/11=19-17/11
y=19-17/11+59/11
y= 19 + 32/11
y=19+2целых 10/11
y = 21целая10/11
НОК (7/15;9/20)=5*3*2*2=60
15:3 20:2
5:5 10:2
1 5:5
15=3*5 1
20=2*2*5
Х/6 = 5/3
х = 6*5 : 3 = 10
5/7х = 20/49
х = 20/49 : 5/7 = 20/49 * 7/5
х = 4/7
340 : 17 * 3 = 60
7/8 * 3/5 = 21/40
2/3 * 0,15 = 2/3 * 3/20 = 1/10 = 0,1