Антон пробежал быстрее;
1)36/12=3(р)
Ответ:Антон пробежал в 3 раза быстрее Филиппа;
8\27:4\9=8\27*9\4=2\3
36\47:18=36\47*1\18=2\47
42:6\7=42\1*7\6=49
3 1\9:2 11\12= 28\9*12\35=4\3*4\5=16\15=1 1\15
8\25:3 1\5: 1 1\4=8\25*5\16*4\5=2\25
2,04:3\5=2,04:0,6=3,4
Парабола ветви вверх так как а>0
вершина в точке
2х-4=0
х=4/2=2
у=2²-4*2-5=4-8-5=-6
пересечение с осью х (у=0)
х²-4х-5=0
<span><span>D=<span><span>b2</span>−<span><span>4a</span>c</span></span></span>=</span><span><span><span><span><span>(<span>−4</span>)</span>2</span>−<span><span>4·1</span>·<span>(<span>−5</span>)</span></span></span>=<span>16+20</span></span>=36</span>
<span>(<span>D>0</span>)</span>, следовательно это квадратное уравнение имеет 2 различных вещественных корня:
Вычислим корни:
<span><span>x<span>(<span>1,2</span>)</span></span>=<span><span><span>−b</span>±√D</span><span>/2a
</span></span></span><span><span><span><span>x1=<span><span><span>−b</span>+√D/</span><span>2a</span></span></span>=<span><span><span>−<span>(<span>−4</span>)</span></span>+6/</span><span>2·1</span></span></span>=<span>10/2</span></span>=5
</span><span><span><span><span>x2=<span><span><span>−b</span>−√D</span><span>/2a</span></span></span>=<span><span><span>−<span>(<span>−4</span>)</span></span>−6</span><span>/2·1</span></span></span>=<span><span>−2/</span>2</span></span>=<span>−1</span></span>
<span><span>x1</span>=5</span>
<span><span>x2</span>=<span>−<span>1
таблица точек
</span></span></span>х у
<span><span>-4 27</span><span>
-3 16</span><span>
-2 7</span><span>
-1 0
</span><span>0 -5
</span><span>1 -8</span><span>
2 -9</span><span>
3 -8</span><span>
4 -5</span><span>
5 0</span><span>
6 7
</span><span>7 16</span><span>
8 27</span></span>
Зайди в решебник по матиматике
![(\sqrt[3]{135}+\sqrt[3]{40}):\sqrt[4]{5\cdot\sqrt[3]{5}}= (\sqrt[3]{3^3\cdot5}+\sqrt[3]{2^3\cdot5}):\sqrt[4]{\sqrt[3]{5^4}}=\\\\=(3\sqrt[3]{5}+2\sqrt[3]{5}):{\sqrt[12]{5^4}}=5\sqrt[3]{5} : \sqrt[3]{5}=5](https://tex.z-dn.net/?f=%28%5Csqrt%5B3%5D%7B135%7D%2B%5Csqrt%5B3%5D%7B40%7D%29%3A%5Csqrt%5B4%5D%7B5%5Ccdot%5Csqrt%5B3%5D%7B5%7D%7D%3D+%28%5Csqrt%5B3%5D%7B3%5E3%5Ccdot5%7D%2B%5Csqrt%5B3%5D%7B2%5E3%5Ccdot5%7D%29%3A%5Csqrt%5B4%5D%7B%5Csqrt%5B3%5D%7B5%5E4%7D%7D%3D%5C%5C%5C%5C%3D%283%5Csqrt%5B3%5D%7B5%7D%2B2%5Csqrt%5B3%5D%7B5%7D%29%3A%7B%5Csqrt%5B12%5D%7B5%5E4%7D%7D%3D5%5Csqrt%5B3%5D%7B5%7D+%3A+%5Csqrt%5B3%5D%7B5%7D%3D5)
Если 2,5% числа равны 5, то само число равно
5 : 0,025 = 200
Ответ: 200
