Explicação passo-a-passo:
a) (12x - 8) ÷ 2 = 6x - 4
(6x + 2) ÷ 2 = 3x + 1
P = 12x - 8 + 6x + 2
P = 18x - 6
b) P = 2 × (12x - 8) + 2 × (6x + 2)
P = 24x - 16 + 12x + 4
P = 36x - 12
P = (36 × 5) - 12
P = 180 - 12
P = 168 cm
c) P = 18x - 6
P = (18 × 5) - 6
P = 90 - 6
P = 84 cm
d) 36x - 12 = 132
36x = 132 + 12
36x = 144
x = 144 ÷ 36
x = 4 cm
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Explicação passo-a-passo:
a) (12x - 8) ÷ 2 = 6x - 4
(6x + 2) ÷ 2 = 3x + 1
P = 12x - 8 + 6x + 2
P = 18x - 6
b) P = 2 × (12x - 8) + 2 × (6x + 2)
P = 24x - 16 + 12x + 4
P = 36x - 12
P = (36 × 5) - 12
P = 180 - 12
P = 168 cm
c) P = 18x - 6
P = (18 × 5) - 6
P = 90 - 6
P = 84 cm
d) 36x - 12 = 132
36x = 132 + 12
36x = 144
x = 144 ÷ 36
x = 4 cm