①劳动是人类生存和发展的第一需要 ②劳动不断地创造物质财富和精神财富
③劳动者是我国社会发展的基本依靠 ④劳动既有分工之别又有高低贵贱之分
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A. What are they? B. Where did you go? C. What did you do there? D. What was the talk show about? E. How was the pollution caused? F. It's our duty to protect the environment. G. Would you like to help protect the environment? |
A: Hello, Jack! I called you last night but you weren't in.
B: Oh, I went to the TV station of our city.
A: Really?
B: I took part in a talk show.
A:
B: It was about how to be a greener person.
A: Sounds great! It is very important for everyone to be a greener person, isn't it?
B: Yes.
A: What should we do to be a greener person?
B: We can obey the three R's.
A: The three R's?
B: Reduce, reuse and recycle.
A: Oh, I see. Ifs very kind of you to tell me so much.
B: It's my pleasure.
=-5
B . (-
)-2=16
C . x6÷x3=x2
D . (x3)2=x5

=3,
=7,反过来,得到3=
,7=
,由此我们可以将式子9
和4
进行化简,即9
=
=
;4
=
=
.依照上面的方法,化简下列各式:
;
;
.
=
,下列说法正确的是( )
和
(其中
且
)的大致图象只可能是( )
B .
C .
D .


米的椭圆形跑道上练习跑步,两人站在同一起跑线上,已知王力每秒钟跑
米,李刚每秒钟跑
米.请你根据以上信息提出问题,并解答(所提问题的解答必须用上题目所有数据条件).
0,-2.5,
,∣-5∣,-
.
