A)
x = 1/2 + 1/2
x = 2/2
x =1
б)
x = 1/4 + 1/3
x = 3/12 + 4/12
x = 7/12
в)
x = 1/12+1/18
x = 3/36 + 2/36
x = 5/36
г)
x = -1/3 + 1
x = 2/3
д)
x = 11 - 1/7
x = 10 6/7
е)
x = 1 - 1 1/5
x = -1/5
ж)
x = 6 1/3 - 3 2/3
x = 2 2/3
з)
x = 2 1/2 - 7/9
x = 2 9/18 - 14/18
x = 1 13/18
и)
x = 2 1/2 - 1 3/5
x = 2 5/10 - 1 6/10
x = 9/10