A) 19 - ( - 12)
<img src="https://tex.z-dn.net/?f=19-%28-12%29" />
<img src="https://tex.z-dn.net/?f=19%2B12" />
<img src="https://tex.z-dn.net/?f=31" />
Solución(a) : 31
b) ( - 82) - 9
<img src="https://tex.z-dn.net/?f=%28-82%29-9" />
<img src="https://tex.z-dn.net/?f=-82-9" />
<img src="https://tex.z-dn.net/?f=-91" />
Solución(b) : - 91
c) - 6 - ( - 27)
<img src="https://tex.z-dn.net/?f=%20-6-%28-27%29" />
<img src="https://tex.z-dn.net/?f=-6%2B27" />
<img src="https://tex.z-dn.net/?f=%2B%2827-6%29" />
<img src="https://tex.z-dn.net/?f=21" />
Solución(c) : 21
d) 18 - ( - 2)
[img = 10]
[img = 11]
[img = 12]
Solución(d) : 20
e) - 18 - ( - 4)
[img = 13]
[img = 14]
[img = 15]
Solución(e) : - 14
f) ( - 12) - ( - 11)
[img = 16]
[img = 17]
[img = 18]
Solución(f) : - 23
g) 37 - ( - 7)
[img = 19]
[img = 20]
[img = 21]
Solución(g) : 44
h) ( - 19) - ( - 13)
[img = 22]
[img = 23]
[img = 24]
Solución(h) : - 6
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Espero te sirva¡.