a) -7/8+4,5b) 13/4+19/5c) -8/11-5/3d) 79,05-12,4e) 123-35/4f)...

Resposta:

Explicação passo a passo:

A) -7/8+4,5
= -7/8 + 45/10 (:5)/(:5)
= -7/8 + 9/2
Mmc (2,8)= 8
= (-7+4.9)/8
= (-7+36)/8
= 29/8
________

b) 13/4+19/5
Mmc (5,4)= 20
= (5.13+4.19)/20
= (65+76)/20
= 141/20
_________

c) -8/11-5/3
Mmc (3,11)= 33
(-3.8 -11.5)/33
(-24-55)/33
= -79/33
____________

d) 79,05-12,4

79,05
-12,40
----------
66,65
__________

e) 123-35/4
= (4.123-35)/4
= (492-35)/4
= 457/4
__________

f) 1. 347,01+132,86

1347,01
+132,86
-------------
1479,87

____________

g) 49/7+(-18/3)
= 7-6
= 1
_________

h) 50-4,99
50,00
- 4,99
----------
45,01​