Question

o valor de x na proporção x/2.(1+3/4) =2/5

Answer 1

x/(2(1+3/4)) = 2/5

x/(2*(7/4)) = 2/5

x/(14/4) = 2/5

x/(7/2) = 2/5

x = (2/5)*(7/2) = 7/5

Answer 2

Oi !

Temos as proporções :

X / ( 2 • ( 1 + 3 / 4 ) ) = 2 / 5

X / ( 2 • 3 + 1 / 4 ) = 2 / 5

X / ( 6 + 1 / 4 ) = 2 / 5

X / ( 7 / 4 ) = 2 / 5

X / ( 7 / 4 ÷ 2 ) = 2 / 5

X / ( 7 / 2 ) = 2 / 5

2 / 7 X = 2 / 5

X = 2 / 7 ÷ 2 / 5

X = 7 • 2 / 2 • 5

X = 14 / 10

X = 14 ÷ 2 / 10 ÷ 2

X = 7 / 5