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  {
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   "source": [
    "# 13-09 · Цикл или функция?\n",
    "\n",
    "Практика к разделу [«Зачем программе функции»](../../site/chapters/glava-13/13-09-zachem-programme-funkcii.html)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "3a0b9259",
   "metadata": {},
   "source": [
    "## Цель\n",
    "\n",
    "Определить и переиспользовать функцию для вычисления."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "88c5c9d9",
   "metadata": {},
   "source": [
    "## Рабочий пример"
   ]
  },
  {
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   "execution_count": 1,
   "id": "f1d3c7eb",
   "metadata": {
    "execution": {
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     "iopub.status.busy": "2026-08-17T18:53:49.561623Z",
     "iopub.status.idle": "2026-08-17T18:53:49.585116Z",
     "shell.execute_reply": "2026-08-17T18:53:49.584535Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "25\n",
      "49\n"
     ]
    }
   ],
   "source": [
    "def summa_kvadratov(a, b):\n",
    "    return a ** 2 + b ** 2\n",
    "\n",
    "def kvadrat_summy(a, b):\n",
    "    return (a + b) ** 2\n",
    "\n",
    "print(summa_kvadratov(3, 4))\n",
    "print(kvadrat_summy(3, 4))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f4d529cc",
   "metadata": {},
   "source": [
    "## Задание ★ Базовая практика\n",
    "\n",
    "Используйте обе функции, чтобы найти разницу между квадратом суммы и суммой квадратов для a=3, b=4."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "56a3b840",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-17T18:53:49.586287Z",
     "iopub.status.busy": "2026-08-17T18:53:49.586149Z",
     "iopub.status.idle": "2026-08-17T18:53:49.588457Z",
     "shell.execute_reply": "2026-08-17T18:53:49.588051Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "24\n"
     ]
    }
   ],
   "source": [
    "raznost = kvadrat_summy(3, 4) - summa_kvadratov(3, 4)\n",
    "print(raznost)"
   ]
  }
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