学校买来a箱笔记本和b箱铅笔盒奖励表现优秀的同学，每箱笔记本360元，每箱铅笔盒150元．
（1）用含有字母的式子表示学校买笔记本和铅笔盒共花多少元钱．
（2）当a=2，b=12时，学校买笔记本和铅笔盒共花多少元钱？
（1）a×360+b×150，
=360a+150b（元）．
答：学校买笔记本和铅笔盒共花360a+150b元．
（2）当a=2，b=12时，
360a+150b，
=360×2+150×12，
=720+1800，
=2520（元）．
答：学校买笔记本和铅笔盒共花2520元．
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| My name is Alice. I'm 11. 1 a little sister. She's 9. 2 name is Kate. We have different habits(习惯). I like 3 TV very much. I like to watch ping-pong games 4 TV. I think they're fun. I like vegetables, such as carrots, 5 and so on. I also like apples and eggs. They're good for us. Kate 6 running. She thinks it's interesting. But I think they're 7 . Kate doesn't like vegetables, 8 she likes French fries and ice cream. And she also likes hamburgers. I 9 think they're healthy. So I don't eat 10 . | |||
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