该图表显示了一台打印机在 7 分钟内打印的页数。按此速率，该打印机在 20 分钟内将打印多少页？答案：___

它不会直接告诉你答案，而是问你卡在哪一步看看 AI 是怎么陪你一步步弄懂这道题的

完整解法

1. Read a clear point from the graph to find the printing rate

From the graph, the line passes through $(4, 50)$ .
This means $50$ pages are printed in $4$ minutes.

2. Calculate the number of pages printed in 1 minute (the rate)

Rate $= \frac{50}{4} = 12.5$ pages per minute.

3. Calculate the number of pages printed in 20 minutes

Pages in 20 minutes $= 12.5 \times 20 = 250$

答案

$250$

AI 分析，可能出错

用 AI 批改，圈出写错的那一步，并自动将你的薄弱点存入错题本，形成你的错因库。