该图表显示了去年7月至9月售出的笔记本电脑数量。 8月和9月售出的笔记本电脑总数是这3个月售出的笔记本电脑总数的 $\frac{2}{3}$ 。代表9月售出笔记本电脑数量的条形图尚未画出。通过涂色完成图表，以显示9月份售出的笔记本电脑数量。答：

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. Determine the fraction of laptops sold in July

Since August and September account for $\frac{2}{3}$ of the total, July accounts for $1 - \frac{2}{3} = \frac{1}{3}$ of the total.

2. Relate the fraction for July to the units on the graph

From the graph, July has 3 units. So, $\frac{1}{3}$ of the total is 3 units.

3. Calculate the total units for August and September

Since $\frac{1}{3}$ of the total is 3 units, $\frac{2}{3}$ of the total is $3 \times 2 = 6$ units. This is the total for August and September.

4. Determine the units for September

From the graph, August has 5 units. Therefore, September has $6 - 5 = 1$ unit.

答案

Shade 1 unit for September.

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