Question

a)-11/55=3/x

b)x+2/4=42/14

c)x+7/4=11-x/2

Answer 1

Olá, bom dia!

a) -11/55 = 3/x → (multiplica cruzado)

-11.x = 55.3

-11x = 165

x = 165/-11

x = -15

b) x+2/4 = 42/14 → (multiplica cruzado)

14.x+14.2 = 4.42

14x+28 = 168

14x = 168-28

14x = 140

x = 140/14

x = 10

c) x+7/4 = 11-x/2 → (multiplica cruzado)

2.x+2.7 = 4.11+4.(-x)

2x+14 = 44-4x

2x+4x = 44-14

6x = 30

x = 30/6

x = 5