问题
解答题
| 利用乘法公式计算： （1）999×1001； （2）(
（2）(
|
答案
（1）原式=×（1000+1）=10002-12=999999；
（2）原式=
x2-2×1 4
xy+y2=1 2
x2-xy+y2．1 4
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| 利用乘法公式计算： （1）999×1001； （2）(
（2）(
|
（1）原式=×（1000+1）=10002-12=999999；
（2）原式=
x2-2×1 4
xy+y2=1 2
x2-xy+y2．1 4
Anna and Jane had tickets for a pop concert in London. They were very excited about the concert. They had planned their day in London very carefully. They worked out which trains to catch, where to eat and where they wanted to go shopping. 小题1:. A friend of Jane’s was working with the sound equipment backstage（后台）. He said he could get them special passes so they could go backstage. He promised to ask the group if the girls could come to say “Hello”. He said that he was sure he could get them the group’s autographs（签名）.小题2: Then two days before the concert, Anna got a cold.小题3:, even though she stayed in bed and took medicine. On the evening before the concert, she had a fever and was very sick indeed. Anna’s mother rang Jane. “Anna is too sick to go to the concert,” she said. “You had better find someone else to go with.” The next day, Anna was feeling very sorry for herself. Then she had a visitor. It was Jane! She came with a big bag of fruit and a pile of their favorite CDs. “I’ll give the tickets to Jill and Sue in the end,” she said. “小题4: . It wouldn’t be much fun without you.”
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