6 км = 3\3 пути (3/3=1)
х км - 2/3 пути
х= (2/3 *6) /1= 4 км
Ответ : 4 км прошел
А) 3*1/2 = 1/2 + 1/2 + 1/2
б) 5*2/3 = 2/3 + 2/3 + 2/3 + <span>2/3 + 2/3
в) 7/10*4 = 7/10 + 7/10 + 7/10 + 7/10
г) 7/9*6 = </span>7/9 + 7/9 + 7/9 + 7/9 + 7/9 + <span>7/9</span>
<span><span><span>
4=2*2
</span><span>
6=2*3
</span><span>
8=2*2*2
</span><span>9=3*3
</span><span>10=2*5
</span><span>12=2*2*3
</span><span>14=2*7
</span><span>15=3*5
</span><span>16=2*2*2*2
</span><span>
18=2*3*3
</span><span>20=2*2*5
</span><span>21=3*7
</span><span>22=2*11
</span><span>24=2*2*2*3
</span><span>25=5*5
</span><span>26=2*13
</span><span>28=2*2*7
</span><span>30=2*15
</span></span></span>