有两个底面半径分别为9厘米、12厘米且高度相等的圆柱形容器甲和乙，把装满甲容器的水倒入空的乙容器中，水深比乙容器的高度的
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设容器的高为x厘米，则容器B中的水深就是（
x-1）厘米，根据题意可得方程：5 8
3.14×92×x=3.14×122×（
x-1），5 8
3.14×81×x=3.14×144×（
x-1），5 8
254.34x=282.6x-452.16，
28.26x=452.16，
x=16；
答：这两个容器的高度是16厘米．
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| One bright summer day, boys and girls were having a walk with their teacher near the zoo. They walked and 1 happily. After a while, they came to a 2 over the river, and they took turns to go across it. When they just reached the middle, there came a great shout of warning behind them. The teacher told them 3 , and she turned back and listened. When she heard the voice" 4 !", she knew what would happen. Before she could do anything she saw a wolf 5 towards the bridge. "Children," said the teacher,"Don't worry, don't move 6 cry." Then she ran to the back of the children 7 the wolf should meet her first. The wolf came, and its mouth was widely open. When it passed the teacher, the wolf saw a boy. It stopped and wanted to snap (咬) at the boy. When the teacher 8 this, she put her right hand into the wolf's 9 quickly. The wolf was so frightened, and it 10 at once. When people heard of it, they all spoke highly of her bravery (勇敢). | ||||
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