80*80:100*25=1600 тележек.....................
3x² - 7x + 4 = 0
D = 49 - 48 = 1
x1 = (7-1)/6 = 1
x2 = (7+1)/6 = 4/3
Ответ: 1 и 4/3
- 2 3/8 + 1/3 - 1 4/9 - 5/9 + 2/3 - 3 5/8 =
= (1/3 + 2/3) - (2 3/8 + 3 5/8) - (1 4/9 + 5/9) =
= 3/3 - 5 8/8 - 1 9/9 = 1 - 6 - 2 = - 7.
Ответ: (-7).
Площадь круга равна - пи R2 = 3/14 * 6 * 6 = 113 .04 см 2