3/7:30=3/7*1/30=3/210=1/70 <span>часть орехов белка съедала за один день</span>
1) 3 1/2-5/9=7/2-5/9=63/18-10/18=53/18=2 17/18
2) 5/4-1/3=15/12-4/12=11/12
3) 28/15-2/5=28/15-6/15=22/15=1 7/15
4) 4/3-5/6=8/6-5/6=3/6=1/2
5) 23/10-4/15=69/30-8/30=61/30=2 1/30
6) 25/8-1/6=75/24-4/24=71/24=2 23/24
<span>d+1/5=4/7+3/7</span>
<span>д+1/5=7/7</span>
<span>д=1-1/5</span>
<span>д=4/5</span>
<span>
</span>
<span><span>f+4/5=4/7+3/7</span></span>
<span><span>f+4/5=7/7</span></span>
<span><span>f=1-4/5</span></span>
<span><span>f=1/5</span></span>
<span><span>
</span></span>
<span><span><span>b+2/5=4/7+3/7</span></span></span>
<span><span><span>b+2/5=7/7</span></span></span>
<span><span><span>b=1-2/5</span></span></span>
<span><span><span>b=3/5</span></span></span>
Скорость второго 72 *7/12=42км/ч
72-42=30км скорость удаления между ними
30*2,48= 74,4 км будет расстояние между ними