Question

calcule as ecuaçoes ​

Answer 1

Resposta:

a) X = 16

b) X = 7,5

c) X = 20

d) X = 10,5

Explicação passo a passo:

a) X +  5 = 21 → X = 21 - 5  X = 16

b) 2X + 3 = 18 → 2X = 18 - 3 → 2X = 15 → X = 15/2 → X = 7,5

c) 10X = 20 + 9X → 10X - 9X = 20 → X = 20

d) 2/3 X + 5 = 12 → 2/3 X = 12-5 → 2/3 X = 7 → 2X = 3 x 7 → 2X = 21 → X = 21/2 → X = 10,5