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7. Calcula as seguintes somas algébricas a) (-8)+(-9)-(-10) c) (-8)-(+7)+(-5)-(20) e) (-15)-(+7)-(-9)+(13) g) (+32)+(-25)+(-45)+(+63) b) (+5)+(-3)-(-5)-(+9)+(-2) d) (-14)+(-8)-(-9) f) (-17)+(+12)-(-15)-(+12)-(+8) h) (+14)+(-7)+(+8)-(-7)-(+8)-(-5)
7. Calcula as seguintes somas algébricas a) (-8)+(-9)-(-10) c) (-8)-(+7)+(-5)-(20) e) (-15)-(+7)-(-9)+(13) g) (+32)+(-25)+(-45)+(+63) b) (+5)+(-3)-(-5)-(+9)+(-2) d) (-14)+(-8)-(-9) f) (-17)+(+12)-(-15)-(+12)-(+8) h) (+14)+(-7)+(+8)-(-7)-(+8)-(-5)
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respostas:
a)(-8)+(-9)-(-10)
-8-9+10
-17+10= -7
c)(-8)-(+7)+(-5)-(20)
-8-7-5-20
-15-5-20
-20-20= -40
e)(-15)-(+7)-(-9)+(13)
-15-7+9+13
-22+9+13
-13+13= 0
g)(+32)+(-25)+(-45)+(+63)
+32-25-45+63
+7-45+63
-38+63= +25
b) (+5)+(-3)-(-5)-(+9)+(-2)
+5-3+5-9-2
+2+5-9-2
+7-9-2
-2-2= -4
d) (-14)+(-8)-(-9)
-14-8-9
-22-9= -31
f) (-17)+(+12)-(-15)-(+12)-(+8)
-17+12+15-12-8
-5+15-12-8
+10-12-8
-2-8= -10
h) (+14)+(-7)+(+8)-(-7)-(+8)-(-5)
+14-7+8+7-8+5
+7+8+7-8+5
+15+7-8+5
+22-8+5
+14+5= +19