Х - 1 2/5 = 5 1/2
х = 5 1/2 + 1 2/5 = 5 5/10 + 1 4/10
х = 6 9/10
проверим:
6 9/10 - 1 2/5 = 5 1/2
6 9/10 - 1 4/10 = 5 1/2
5 5/10 = 5 1/2
5 1/2 = 5 1/2
2 1/3 + х = 3 1/6
х = 3 1/6 - 2 1/3 = 3 1/6 - 2 2/6 = 19/6 - 14/6
х= 5/6
проверим:
2 1/3 + 5/6 = 3 1/6
2 2/6 + 5/6 = 3 1/6
2 + 7/6 = 3 1/6
2 + 1 1/6 = 3 1/6
3 1/6 = 3 1/6
х: 3 = 1 2/3
х = 1 2/3 * 3 = 5/3 * 3/1 = 5/1
х = 5
проверим:
5: 3 = 1 2/3
5/3 = 1 2/3
1 2/3 = 1 2/3
4х = 12 4/5
4х = 64/5
х = 64/5 : 4 = 64/5 * 1/4 = (16*1)/(5*1)=16/5
х= 3 1/5
проверим:
4 * 3 1/5 = 12 4/5
4/1 * 16/5 = 12 4/5
64/5 = 12 4/5
12 4/5 = 12 4/5