Question

Calcule o valor de N quando:
a) N= 2•(+7)+5•(-2)= ?

b) N= 2•(+10)+5•(-2)-10= ?

c) N= 3•(-1)-5•(-1)+4•(-1)= ?

d) N= 10-(-1)+(-1)•3-2•(+3)+2= ?

e) N= 8•(-5)-(-7)•(+2)-3-4•(-1)+6=?


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Answer 1

Resposta:

a) N = 2.7 + 5(- 2)

N = 14 - 10 = 4

b) N= 2.(+10)+5.(-2)-10

N=20-10-10

N=10-10 = 0

c) N=3.(-1)-5.(-1)+4.(-1)

N= -3 +5 - 4

N= 2 - 4 = 2

d) N=10+1-1×3-2×3+2

N=10+1-3-6+2

N=11-3-4

N=11-7 = 4

e) N=8 × (-5) - (-7) × 2 - 3 - 4 × (-1) + 6 =

N=-40 - (-14) - 3 + 4 +6 =

N=-40 + 14 - 3 + 10 =

N=-26 + 7 = -19