x-drumul parcurs
I.
[tex] \frac{4}{5} \: din \: x \\ [/tex]
II.
[tex] \frac{2}{4} (x - \frac{4x}{5} ) = \frac{2}{4}(\frac{5x - 4x}{5} ) = \frac{2x}{20} = { \frac{2x}{20} }^{(2} = \frac{x}{10} [/tex]
III.32km
I+II+III=x
4×/5+×/10+32=×
aducem la acelasi numitor
in ambii membrii Si dispare numitorul
8x+x+320=10x
9x+320=10x
10x-9x=320
x=320 km