Question

1.determime o valor de x nas equaçoes do 1° grau abaixo

a)3×=300
b)5×=5000
c)7×-2×=50
d)10×-5×=25
e)3×+40=30
f)3×-2×=5
g)5×+4×=90
h)4×-46=86
i)3 (×-1)=6
j)4 (2×-3)=5 (×+3)







5x = 5000​

Answer 1

Resposta: Segue na resolução.

Resolução:

• a)

          $3x = 300\\x = 300/3 \\x = 100$

• b)

          $5x = 5000\\x = 5000/5 \\x = 1000$

• c)

          $7x - 2x = 50 \\5x = 50 \\x = 50/5 \\x = 10$

• d)

          $10x - 5x = 25 \\5x = 25 \\x = 25/5 \\x = 5$

•  e)

           $3x + 40 = 30 \\3x = -10 \\x = -10/3$

• f)

           $3x - 2x = 5 \\x = 5$

• g)

          $5x + 4x = 90 \\9x = 90\\x = 90/9 \\x = 10$

• h)

          $4x - 46 = 86 \\4x = 40 \\x = 10$

• i)

          $3(x - 1) = 6 \\3x - 3 = 6 \\3x = 9 \\x = 3$

• j)

          $4 (2x - 3) = 5 (x + 3)\\8x - 12 = 5x + 15 \\3x = 27 \\x = 9$