A moment ago,there were a total of 72 people in room A and room B. 30 people from room A moved to room B. As a result, there are now 8 times as many people in room B as in room A. How many more people were there in room A than room B at first?
请教家长们不用二元方程式怎么解？
小学教的是画小格子的方法，大人也是要花一段时间才能适应。
新加坡的数学题很好玩啊
对的，画模块。很容易理解。
请问这是几年级的题？
书局买的四年级练习题。