Question

2. Calculează: a) [(2.4-3).(-1-2)+9]:(-3)+3=
b)(-5)2 +3.[ 7+(-4): (-1)]=
c) 4.(-7)- 4.11+4.8=​

Answer 1

a)

[(2×4-3)×(-1-2)+9]:(-3)+3

[(8-3)×(+3)+9]:(-3)+3

[5×(-3)+9]:(-3)+3

(-15+9):(-3)+3

-6:(-3)+3

2+3=5

b)

(-5)×2+3×[7+(-4):(-1)]

-10+3×[7-(-4)]

-10+3×(7+4)

-10+3×11

-10+33=23

c)

4×(-7)-4×11+4×8

-4×7-4×11+4×8 (dam factor comun)

4×(-7-11+8)

4×(-10)=-40