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   "source": [
    "# 1. 基础准备及入门"
   ]
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   "source": [
    "1. 请指出如下5个变量名中，哪些是合法的？\n",
    "\n",
    "\t`abcd-2\txyz\u001f_3\t3chan\ta变量\tABCDefgh`"
   ]
  },
  {
   "cell_type": "markdown",
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   "source": [
    "2. 在指令窗中，运行指令a=sqrt(2)。然后请回答以下问题：计算结果a是精准的$\\\\sqrt{2}$吗？该计算结果只是5位有效数字精度的$\\\\sqrt{2}$近似吗？请在指令窗中，显示出具有最多位有效数字的$\\\\sqrt{2}$近似值？再请恢复MATLAB数值结果显示的默认设置。\n"
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   "source": [
    "```matlab\n",
    "vpa(sqrt(2),90)\n",
    "vpa(sqrt(2)-vpa(sqrt(2),50),100)\n",
    "```"
   ]
  },
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   "source": [
    "3. 设 a = -8 , 运行以下三条指令，问运行结果相同吗？为什么？\n",
    "\n",
    "```matlab\n",
    "w1=a^(2/3)\t\t\n",
    "w2=(a^2)^(1/3)\t\n",
    "w3=(a^(1/3))^2\t\n",
    "```"
   ]
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   "cell_type": "markdown",
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   "source": [
    "4. 指令clear, clf, clc各有什么用处？"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "5.想要在MATLAB中产生二维数组$S=\\\\left[\\\\begin{array}{lll}{1} & {2} & {3} \\\\\\\\ {4} & {5} & {6} \\\\\\\\ {7} & {8} & {9}\\\\end{array}\\\\right]$，下面哪些指令能实现目的？\n",
    "\n",
    "```matlab\n",
    "S=[1,2,3;4,5,6;7,8;9]\n",
    "S=[1  2  3;4  5  6;7  8  9]\n",
    "S=[1，2，3；4，5，6；7，8，9]      \t%整个指令在中文状态下输入\n",
    "```"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "6. MATLAB桌面上有哪些图标和超链接可引出帮助浏览器？它们又有什么不同？\n"
   ]
  }
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