Question

17. Completati tabelul:
a) A=-5
B=+11
C=-234
AxB=
BxC=
(AxB)xC=
Ax(BxC)=
AxB+AxC
Ax(B+C)=
b)A=51
B=-10
C=+5
AxB=
BxC=
(AxB)xC=
Ax(BxC)=
AxB+AxC
Ax(B+C)=
c) A=0
B=81
C=-101
AxB=
BxC=
(AxB)xC=
Ax(BxC)=
AxB+AxC
Ax(B+C)=

Answer 1

Răspuns:

a)

A = - 5; B = 11; C = - 234

A × B = (-5) × 11 = - 55

B × C = 11 × (- 234) = - 2574

(A × B) × C = (- 55) × (- 234) = 12870

A × (B × C) = (- 5) × (- 2574) = 12870

A × B + A × C = - 55 + (- 5) × (- 234) = - 55 + 1170 = 1115

A × (B + C) = (- 5) × (11 - 234) = (- 5) × (- 223) = 1115

b)

A = 51; B = - 10; C = 5

A × B = 51 × (- 10) = - 510

B × C = (- 10) × 5 = - 50

(A × B) × C = (- 510) × 5 = - 2550

A × (B × C) = 51 × (- 50) = - 2550

A × B + A × C = - 510 + 51 × 5 = - 510 + 255 = - 255

A × (B + C) = 51 × (- 10 + 5) = 51 × (- 5) = - 255

c)

A = 0; B = 81; C = - 101

A × B = 0 × 81 = 0

B × C = 81 × (- 101) = - 8181

(A × B) × C = 0 × (- 101) = 0

A × (B × C) = 0 × (- 8181) = 0

A × B + A × C = 0 + 0 × (- 101) = 0

A × (B + C) = 0 × (81 - 101) = 0