a)
D₁=770 km=77000000 cm
D₂=590 km=59000000 cm
D₃=330 km=33000000 cm
d/D=1/n
d/77000000=1/1000000
d₁=77000000/1000000=77 cm
d₂=59 cm
d₃=33 cm
b)
0,25x=0,(3)y x/4=y/3 y=3x/4
x+y=770 km
x+3x/4=770
4x+3x=3080
7x=3080
x=440 km
y=770-440=330 km
2.
a)
236,68 km² =2366800 ari orasul
12000 m² =120 ari strandul
6 ha = 600 ari parc
b)
120:600=0,2 = 20%