<span><span><span><span>
а
</span><span>
10
</span><span>
100
</span><span>
1000
</span><span>
10000
</span><span>
100000
</span></span><span><span>
а*10
</span><span>
100
</span><span>
1000
</span><span>
10000
</span><span>
100000
</span><span>
1000000
</span></span><span><span>
а:10
</span><span><span> 1</span></span><span>
10
</span><span>
100
</span><span>
1000
</span><span>
10000
</span></span><span><span>
а+10
</span><span>
20
</span><span>
110
</span><span>
1010
</span><span>
10010
</span><span>
100010
</span></span><span><span>
а-10
</span><span>
0
</span><span>
90
</span><span>
990
</span><span>
9990
</span><span>
99990
</span></span></span></span>
7м2с=422с
1ч=3600с
2ч5м=7500с
15м2с=902с
12м=720с
2м10с=130с
1ч5с=3605с
- A M H
--------|----|----|----|---|---|-----|----|----|----|-----|----|--
-8 -3 0 3
M(-3) H(3)
Системка:
16/x-16/y=8/3
16/(x+y)=1
решение:
x+y=16/1
x=16-y
16/(16-y)-16/y=8/3
(16/(16-y)-16/y)*y=8/3*y
(-32y+256)/(y-16)=8y/3
(-32y+256)/(y-16)*(-y+16)=8y/3*(-y+16)
32y-256=-8y^2/3+128y/3
8y^2/3-32y/3-256=0
D=(-32/3)^2-4*(8/3)*(-256)=25600/9
y1=(√(25600/9)-(-32/3))/(2*8/3)=12
x=16-12
x=4
ответ: пешеход 4 км в час, велосипедист 12 км в час