1) 4 ·60= 240 (км)- на машине
2) 276 - 240 =36 (км)- на лошади
3) 36 ÷ 4 = 8 (км/ч)
Ответ: скорость на лошади - 8 км/ч.
1/6*(2-3х)+1 1/9-2/3*(х-1)-7/9=1/3-1/2х+1 1/9-2/3х+2/3=(-1/2х-2/3х)+(1/3+1 1/9+2/3)=-1 1/6х+2 1/9
Длина окружности равна 2пиR = 2 * 3/14 * 3 = 18.84
(20 8/15 * 7 1/2 - 54 3/5 * 2/5) : (3 13/21 * 8 2/5 - 29 2/5) - 5/6 * 1 1/5 + 21/25 = =132
1) 20 8/15 * 7 1/2 = 308/15 * 15/2 = 154
2) 54 3/5 * 2/5 = 273/5 * 2/5 = 546/25
3) 154 - 546/25 = 3850/25 -546/25 = 3304/25
4) 3 13/21 * 8 2/5 = 76/21 * 42/5 = 152/5
5) 152/5 - 29 2/5 = 152/5 - 147/5 = 5/5 = 1
6) 5/6 * 1 1/5 = 5/6 * 6*5 = 1
7) 3304/25 : 1 = 3304/25
8) 3304/25 - 1 = 3304/25 - 25/25 = 3279/25
9) 3279/25 + 21/25 = 3300/25 = 132