问题
解答题
化简：a-4(2a-b)-2(a+2b)
答案
-9a
题目分析：先去括号，再合并同类项即可.
原式=a-8a+4b-2a-4b=-9a.
点评：解答本题的关键是注意在去括号时，若括号前是“-”号，把“-”号和括号去掉，括号里各项的符号都要改变.
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化简：a-4(2a-b)-2(a+2b)
-9a
题目分析：先去括号，再合并同类项即可.
原式=a-8a+4b-2a-4b=-9a.
点评：解答本题的关键是注意在去括号时，若括号前是“-”号，把“-”号和括号去掉，括号里各项的符号都要改变.
| 用所给单词的适当形式填空。 | |
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| When Walt Disney was young,he wanted very much to be a(n) __1__.One day he __2__ along some of his pictures and went to a newspaper office in the __3__ of getting a job there.__4__,they were not interested in them. His friends tried to __5__ him. Disney didn't lose __6__.He __7__ to draw lots of pictures. His family were poor and he used to stay in the family garage and draw __8__ there.One day a mouse came into the garage and played on the floor.Disney stopped __9__ and watched the mouse. The mouse came towards him and he gave it a piece of bread. __10__ the mouse came and danced on his table. Day after day the mouse returned and was given more bread. In this way over several days the artist and the mouse became good friends. |