{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "未知数 x ， y  \n",
    "解的值定为 -100 - 100  \n",
    "当然这里仅仅是简单呈现，实际上有很多bug需要修改  \n",
    "如果你看不懂eval的用法，建议百度！  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "方程格式：+-*/\n"
     ]
    },
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "输入方程1的左边 x+y\n",
      "输入方程1的左边 1\n",
      "输入方程2的左边 y-x\n",
      "输入方程2的右边 1\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "{x: 0, y: 1}"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from sympy import *  #导入\n",
    "x=Symbol('x')  #设未知数(元)\n",
    "y=Symbol('y') \n",
    "print(\"方程格式：+-*/\")\n",
    "fc1l = input(\"输入方程1的左边\")\n",
    "fc1r = input(\"输入方程1的左边\")\n",
    "fc2l = input(\"输入方程2的左边\")\n",
    "fc2r = input(\"输入方程2的右边\")\n",
    "fc1l = \"(\"+fc1l+\")-(\"+fc1r+\")\"\n",
    "fc2l = \"(\"+fc2l+\")-(\"+fc2r+\")\"\n",
    "solve([fc1l,fc2l],[x, y])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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