1)15+25=40 (м.) маленьких
2)40:4=10(маш.)
3)40-10=30
ответ
на 30 меньшн
(1/2)^2=1^2/2^2=1/4<span>
<span>
</span></span><span><span>(1/3)^2=1^2/3^2=1/9</span>
<span>
</span></span><span><span>(1/10)^3=1^3/10^3=1/1000</span>
<span>
</span></span><span><span>(1/25)^2=1^2/25^2=1/625</span>
<span>
</span></span><span><span>(1/5)^3=1^3/5^3=1/125</span>
<span>
</span></span><span><span>(4/3)^2=4^2/3^2=16/9</span>
<span>
</span></span><span><span>(2/3)^4=2^4/3^4=16/81</span>
<span>
</span></span><span><span>(10/3)^3=10^3/3^3=1000/27</span></span>
Он прошел 2/7 = 4/14 маршрута. До середины ему осталось 3/14 или 9 км
9 : 3/14 = 3×14 = 42
Ответ: 42 км