Question

Efetue:
a) (+15) (+3)

b) (-40) (+5)

c) 500 (+25)

d) (20) (-6)

2) Resolva as equações

a) x-2=10

b) x-5=15

c) 8+3=12

d)8+4=8

e)8+3=1

f)+8=10

Answer 1

1.
a) (+15) (+3) = (+18)

b) (-40) (+5) = (-35)

c) 500 (+25) = (+525)

d) (20) (-6) = (+14)

2.
a) x-2=10
x=10+2
x=12

b) x-5=15
x=15+5
x=20

c) 8+3=12
8+3-12
-1

d) 8+4=8
8+4-8
+4

e) 8+3=1
8+3-1
+10

f) +8=10
+8-10
-2