学校买了2张桌子和5把椅子共付330元，每张桌子的价钱是每把椅子

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问题解答题

学校买了2张桌子和5把椅子共付330元，每张桌子的价钱是每把椅子价钱的3倍，每张桌子多少钱？

答案

设每把椅子x元，每张桌子的价钱是3x，根据题意得：

5x+3×2×x=330，

5x+6x=330，

11x=330，

11x÷11=330÷11，

x=30，

3×30=90（元）；

答：每张桌子90元．

阅读理解

读一读，回答下列问题。

Making breakfast

Today is Sunday. It's seven o'clock in the morning. Jenny's mother is cooking in the kitchen. Jenny and

Li Ming are washing vegetables in the sink. They help Mrs. Smith prepare for the breakfast. How happy they

are! After breakfast, they will go to the zoo to watch the animals.

1. What time is it?

____________________________________________________

2. What is Jenny's mother doing?

____________________________________________________

3. What are Jenny and Li Ming doing?

____________________________________________________

4. Where will they go after breakfast?

____________________________________________________

填空题

脂肪酸在微生物代谢中主要参与（）的组成。