Respuestas

2014-02-04T06:39:19+01:00
Derecho:
x(5)/2 + 7.2 = 32.2
x(5)/2 = 32.2 - 7.2
x(5)/2 = 25
x(5) = 50
x =  10

Al revès:
32.2 - 7.2 = 25
25/(2.5) = 10

Rpta = 10