Question

(+2/3) - (+1/2)=

(+2/3) - (+4/5)=

(-7/0) - (-3/4)=

(-2/5) - (-1/4)=

(-1/2) - (+5/8)=

(+2/5) - (+1/2)=

Answer 1

2/3 - 1/2 = 4/6 - 3/6 = 1/6

2/3 - 4/5 = 10/15 - 12/15 = -2/15

-7/0 + 3/4 impossível

-2/5 + 1/4 = -4/20 + 5/20 = 1/20

-1/2 - 5/8 = -4/8 - 5/8 = -9/8

2/5 - 1/2 = 4/10 - 5/10 = -1/10