Resposta :
a: 6-(-2) = 8
b: 5-(+1) = 4
c: 7-(-3) = 10
d: 9-(+9) = 0
e:-4-(+6) = 10
f: (+15)-(+28) = -13
g: (-20)-(-15) = -5
h: (+18)-(-19) = 37
i: (-16)+(+17) = 1
j: (15)-(-7) = 22
k: 28-(+13) = 15
l: (92)-(+85) = 7
Espero ajudar.
a: 6-(-2) = 8
b: 5-(+1) = 4
c: 7-(-3) = 10
d: 9-(+9) = 0
e:-4-(+6) = 10
f: (+15)-(+28) = -13
g: (-20)-(-15) = -5
h: (+18)-(-19) = 37
i: (-16)+(+17) = 1
j: (15)-(-7) = 22
k: 28-(+13) = 15
l: (92)-(+85) = 7
Espero ajudar.