Răspuns :
4/7=0.2/x
Facem produl pe diagonala
4*x=7*0.2
4*x=7*(2/10)
4*x=7*(1/5)
4*x=7/5
x=7/(5*4)
x=7/20
Facem produl pe diagonala
4*x=7*0.2
4*x=7*(2/10)
4*x=7*(1/5)
4*x=7/5
x=7/(5*4)
x=7/20