X-2 3/4 = 4 5/6
x=4 5/6+2 3/4
x=4 10/12 + 2 9/12
x=6 19/12
x=7 7/12
1) y = 1 1/5 - 5,2 = 1 2/10 - 5 2/10 = ( - 4 ). 2) y = - 1 1/6 - 4 1/8 = - 1 4/24 - 4 3/24 = - 5 7/24
2/5+1/4=8/20+5/20
4/7+2/3=12/21+14/21
66/11+1/2=6+11/22
3, 4/5 * 4, 4/5 = 456/5 = 91, 1/5