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# Untitled

a guest Jan 17th, 2019 51 Never
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1. {
2.  "cells": [
3.   {
4.    "cell_type": "code",
5.    "execution_count": 2,
7.    "outputs": [],
8.    "source": [
9.     "# число делится и на 3 и 5\n",
10.     "def summ(N):\n",
11.     "    summ = 0\n",
12.     "    i = 1\n",
13.     "    for i in range(N+1):\n",
14.     "        if i % 15 == 0 :\n",
15.     "            summ = i + summ\n",
16.     "    return summ\n"
17.    ]
18.   },
19.   {
20.    "cell_type": "code",
21.    "execution_count": 3,
23.    "outputs": [
24.     {
25.      "name": "stdout",
26.      "output_type": "stream",
27.      "text": [
28.       "45\n"
29.      ]
30.     }
31.    ],
32.    "source": [
33.     "print(summ(35))\n"
34.    ]
35.   },
36.   {
37.    "cell_type": "code",
38.    "execution_count": 5,
40.    "outputs": [
41.     {
42.      "name": "stdout",
43.      "output_type": "stream",
44.      "text": [
45.       "33165\n"
46.      ]
47.     }
48.    ],
49.    "source": [
50.     "print(summ(1000))"
51.    ]
52.   },
53.   {
54.    "cell_type": "code",
55.    "execution_count": 6,
57.    "outputs": [],
58.    "source": [
59.     "#Solve a quadratic equation, x**2 + bx + c = 0.\n",
61.     "    D = (b ** 2 - 4 * c)\n",
62.     "    x1 = (-b + D ** 0.5) / 2\n",
63.     "    x2 = (-b - D ** 0.5) / 2\n",
64.     "    return x1, x2\n"
65.    ]
66.   },
67.   {
68.    "cell_type": "code",
69.    "execution_count": 7,
71.    "outputs": [
72.     {
73.      "name": "stdout",
74.      "output_type": "stream",
75.      "text": [
76.       "for b=4, c=3: (-1.0, -3.0)\n"
77.      ]
78.     }
79.    ],
80.    "source": [
81.     "print(\"for b=4, c=3:\", solve_quad(4, 3))\n"
82.    ]
83.   },
84.   {
85.    "cell_type": "code",
86.    "execution_count": 8,
88.    "outputs": [
89.     {
90.      "name": "stdout",
91.      "output_type": "stream",
92.      "text": [
93.       "for b=2, c=1: (-1.0, -1.0)\n"
94.      ]
95.     }
96.    ],
97.    "source": [
98.     "print(\"for b=2, c=1:\", solve_quad(2, 1))\n"
99.    ]
100.   },
101.   {
102.    "cell_type": "code",
103.    "execution_count": 9,
105.    "outputs": [
106.     {
107.      "name": "stdout",
108.      "output_type": "stream",
109.      "text": [
110.       "for b=0.5, c=4: ((-0.2499999999999999+1.984313483298443j), (-0.2500000000000001-1.984313483298443j))\n"
111.      ]
112.     }
113.    ],
114.    "source": [
115.     "print(\"for b=0.5, c=4:\", solve_quad(0.5, 4))\n"
116.    ]
117.   },
118.   {
119.    "cell_type": "code",
120.    "execution_count": 10,
122.    "outputs": [
123.     {
124.      "name": "stdout",
125.      "output_type": "stream",
126.      "text": [
127.       "for b=1e10, c=3: (0.0, -10000000000.0)\n"
128.      ]
129.     }
130.    ],
131.    "source": [
132.     "print(\"for b=1e10, c=3:\", solve_quad(1e10, 3))\n"
133.    ]
134.   },
135.   {
136.    "cell_type": "code",
137.    "execution_count": 11,
139.    "outputs": [
140.     {
141.      "name": "stdout",
142.      "output_type": "stream",
143.      "text": [
144.       "for b=-1e10, c=3: (10000000000.0, 0.0)\n"
145.      ]
146.     }
147.    ],
148.    "source": [
149.     "print(\"for b=-1e10, c=3:\", solve_quad(-1e10, 4))"
150.    ]
151.   },
152.   {
153.    "cell_type": "code",
154.    "execution_count": null,
156.    "outputs": [],
157.    "source": []
158.   }
159.  ],
161.   "kernelspec": {
162.    "display_name": "Python 3",
163.    "language": "python",
164.    "name": "python3"
165.   },
166.   "language_info": {
167.    "codemirror_mode": {
168.     "name": "ipython",
169.     "version": 3
170.    },
171.    "file_extension": ".py",
172.    "mimetype": "text/x-python",
173.    "name": "python",
174.    "nbconvert_exporter": "python",
175.    "pygments_lexer": "ipython3",
176.    "version": "3.6.7"
177.   }
178.  },
179.  "nbformat": 4,
180.  "nbformat_minor": 2
181. }
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