按运算符拆分数学公式且保留运算符，含括号需整体保留

Hey there, let’s break down each formatting rule you need step by step, with examples to make it super clear:

Headings #

Use number signs (#) to create headings—more #s equal a lower heading level:

• Level 1: # My Main Heading
• Level 2: ## A Subheading
• You can go all the way up to Level 6 with ######

List Items #

Start each unordered list item with a dash (-):

• First list entry
• Second list entry
  • Want nested items? Just indent with 2 spaces and add another -

Text Emphasis #

Wrap text in asterisks (*) to emphasize it (this gives you italicized text):

• Example: *This text stands out* renders as This text stands out
• Pro tip: Double up the asterisks (**) if you want bold emphasis too—**Bold text** becomes Bold text

Code & Commands #

Surround single-line code or commands with backticks (`):

• For example: git commit -m "Fix bug"
• For multi-line code blocks, use three backticks at the start and end:

function calculateTotal(items) {
  return items.reduce((sum, item) => sum + item.price, 0);
}

Quoted Text #

Use a greater-than sign (>) to quote text—perfect for citing sources or highlighting important notes:

This is a quoted block of text. It’ll be offset from the main content for clarity.

Links #

Format links like [Display Text](URL):

• Example: [Stack Overflow](https://stackoverflow.com) shows up as Stack Overflow

Images #

For images, use [Alt Text](Image URL)—the alt text helps with accessibility if the image doesn’t load:

• Example: [Stack Overflow Logo](https://cdn.sstatic.net/Sites/stackoverflow/Img/logo.svg) renders as

内容的提问来源于stack exchange，提问作者joeb