June 2023 1 4 Report
7.- Calcula las siguientes sumas de números enteros como en el ejemplo:
(-7) + (-3) = -7 –3 = -10
(-12 ) + (+15) = (-7 ) + (+3 ) = (-8 ) + (-7 ) = (+13 ) + (+8) =
(+14 ) + ( -12) = (+4 ) + (- 16) = ( 0 ) + (-3 ) = (+4 ) + ( 0 ) =
8.- Indica las sumas que son incorrectas.
-2 + 4 = +2 -4 +1 = -3 -8 +3 = +5 -12 +5 = -7
-7 – 9 = -2 -4 –3 = -7 +16 – 8 = -24 -7 +16 = -9
9.- Calcula eliminando los paréntesis cuando sea preciso.
a) (+3) + (- 4) + (- 5) =
b) (-6 ) + (-12) + (-1) =
c) (+3) + (+21) + (-15) =
d) (-5 ) + (+7) + (- 12) =
e) (+14) + (-9 ) + (- 7) =
f) (-12 ) + (- 6 ) + (+3 ) + (-1) =
g) (+5 ) + (-3 ) + (+14 ) + (-2 ) + (- 11) =

h) +13 –5 + 4 –11 =
i) -6 –11 – 4 +45 =
j) +9 – 5 + 11 – 12 + 14 =
k) -15 + 3 + 6 – 12 + 17 =
l) +6 – 2 + 4 – 11 – 16 =
m) - 45 + 13 – 11 + 23 =
n) + 34 – 12 – 5 – 23 =
ayuda plis es pa hoy

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