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Effectuer les opérations suivantes. Donnez les étapes du calcul.
A = (+15) + (-25) A = (+15) - (-25)

B = (-7) + (-7) B = (-7) - (-7)

C = (+9) + (+3) C = (+9) - (+3)

D = (-12) + (+20) D = (-12) - (+20)

E = (-10) + (+10) E = (-10) - (+10)

Calculer les expressions suivantes en regroupant astucieusement.
M = (-2) + (+3,25) - (+1,25) - (-2) P = (-5,5) + (+12) - (+3,5) + (-10)


Sagot :

Bonjour LelaMusic

A = (+15) + (-25)
A = 15 - 25
A = -10 

A = (+15) - (-25)
A = 15 + 25
A = 40

B = (-7) + (-7)
B = -7 - 7
B = -14 

B = (-7) - (-7)
B = -7 + 7
B = 0

C = (+9) + (+3)
C = 9 + 3
C = 12 

C = (+9) - (+3)
C = 9 - 3
C = 6

D = (-12) + (+20)
D = -12 + 20
D = 20 - 12
D = 8 

D = (-12) - (+20)
D = -12 - 20
D = -32

E = (-10) + (+10)
E = -10 + 10
E = 0

E = (-10) - (+10)
E = -10 - 10
E = -20

Calculer les expressions suivantes en regroupant astucieusement.
M = (-2) + (+3,25) - (+1,25) - (-2)

M = ((-2) - (-2)) + ((+3,25) - (+1,25))
M = (-2 + 2) + (3,25 - 1,25)
M = 0 + 2
M = 2

P = (-5,5) + (+12) - (+3,5) + (-10)

P = ((-5,5) - (+3,5)) + ((+12) + (-10))
P = (-5,5 - 3,5) + (12 - 10)
P = -9 + 2
P = -7

Exercice 1 :
A = (+15) + (-25) =  15 - 25
A = - 10 

A = (+15) - (-25) = 15 + 25
A = 40


B = (-7) + (-7) = - 7 - 7
B = -14 

B = (-7) - (-7) = - 7 + 7
B = 0


C = (+9) + (+3) = 9 + 3
C = 12 

C = (+9) - (+3) = 9 - 3
C = 6


D = (-12) + (+20) = - 12 + 20
D = 8 

D = (-12) - (+20)  = - 12 - 20
D = - 32


E = (-10) + (+10) = -10 + 10
E = 0

E = (-10) - (+10)
= -10 - 10
E = - 20


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Exercice 2:

Calculer les expressions suivantes en regroupant astucieusement.

M = (-2) + (+3,25) - (+1,25) - (-2)
M = - 2 + 3,25  - 1,25  + 2
M = (3,25 - 1,25) +
(- 2 + 2)
M =  2 + 0
M = 2


P = (-5,5) + (+12) - (+3,5) + (-10)
P = - 5,5 + 12 - 3,5 - 10
P = (- 5,5 - 3,5) + (12 - 10)
P = - 9 + 2
P = - 7