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#1 · 常错题
#2 · 常错题
将循环小数化为分数:整数、有限小数、循环小数都可以化成分数,整数和有限小数化成分数容易,循环小数如何化成分数呢?请看下面的例子. 将循环小数$0.288\ldots $化成分数:将$0.288\ldots $分别乘$10$和$100$,得$2.88\ldots $和$28.88\ldots $,两个得数相减得$26(两个得数小数部分相同)$,而相减所得的$26$应该是$0.288\ldots $的$\left(100-10\right)
#3 · 常错题
今年市委市政府积极推进创建“全国文明城市”工作,市创城办公室为了调查初中学生对“社会主义核心价值观”内容的了解程度\((\)程度分为:“\(A-\)十分熟悉”,“\(B-\)了解较多”,“\(C-\)了解较少”,“\(D-\)不知道”\()\),对我市一所中学的学生进行了随机抽样调查,根据调查结果绘制了两幅不完整的统计图如图,根据信息解答下列问题: \((1)\)本次抽样调查了多少名学生; \((2)\)补全条形统计图和扇形统计图; \
#4 · 常错题
#5 · 常错题
一批水果的标准质量是$30$千克,超出标准质量记为正,低于标准质量记为负,现记录如下:$+8$,$-9$,$-5$,$+7$,$-8$,$-6$,$+7$,$+10$. $(1)$这批水果总共有多少千克? $(2)$第一天按每千克价格$5$元卖出了这批水果的一半,第二天为了吸引顾客把第一天卖水果的价格降价$20\%$后作为新的价格,卖完了剩下的水果,请计算一下这批水果一共卖了多少钱?
#6 · 常错题
分类讨论思想是数学的重要思想,在学习有理数的过程中,也深有感受$!$ $(1)$当$ab \lt 0$时,若$b \gt 0$,$|a| \lt |b|$,则$a+b \_\_\_\_\_\_0$; $(2)$当$abc \lt 0$时,若$ab \gt 0$,则$c \_\_\_\_\_\_0$; $(3)$已知$a$,$b$,$c$是非零有理数,则$\frac{a}{|a|}+\frac{b}{|b|}+\frac{c}{|c|}=
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阅读理解 One night a patient went fishing in another man's boat outside Albert Smith's hospital. The owner of the boat thought he should get all the fish from the patient. Dr Smith said to the boat owner, "You are right beca
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阅读理解 This is' a story of a man who worked in a big factory. I got to know him many years ago, but I never paid any attention to him. He always wore an old red hat and carried a rubbish bag. He usually spent his break tim
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阅读理解 When I was 13 years old, a boy gave me an important gift. It was a smile. It was the early autumn of my first year at a junior high school, and my old school was far away. As a result, no one knew who I was. I was v
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阅读短文,下列问题 This is a song millions of Americans will hear this New Year's Eve. It is called Auld Lang Syne(《友谊地久天长》). It is the traditional music played during the New Year's celebration. Auld Lang Syne is an old Scottish
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完形填空 A father and his daughter were flying a kite in the park. The young daughter was a little bit tired, so they took a (1) on the bench(长椅). When the daughter saw an old man selling apples, she asked her father to buy
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根据短文理解, 从A、B、C三个选项中选择最佳答案填空。 All Parents love their children. Many parents want their kids to (1) well-known people when they (2) . Most of them want their kids to live better than others. Many of them (3) their kids wil
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阅读下面短文,从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。 Sara lived in a village with her mother. When Sara grew up, she was tired of boring (1) life. She wanted to go out. One morning, she secretly left while her mother was still (2) .
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完形填空 Walt Whitman was a famous American poet (诗人). He was born (1) Mary 31, 1819, in Long Island. There were nine (2) in his family, and he was the second. (3) he was four years old, his family moved to Brooklyn because
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阅读理解 Radios, telephones and televisions are widely used in the world. When you switch on the radio, you can listen. But when you use the telephone, not only can you listen to others, but also you can chat with them. Howe
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阅读理解 When you watch TV and play video games you make global warming(全球变暖) worse! To make electricity, fossil fuels(矿物燃料) are burned in big factories. But burning fossil fuels also makes greenhouse gases. This means that
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完形填空 How would you use a radio or a telephone if you had no electricity or batteries? This (1) bothered(使烦恼)British inventor Trevor Baylis. Then he made a wind-up(装有发条的)radio. It doesn't need (2) or batteries. You wind i
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根据短文理解, 从A、B、C三个选项中选择最佳答案填空。 Mrs. Black has have (1) of trouble with her skin, (2) she goes to see her doctor about it. The doctor can't find (3) wrong with her. But he gives her some tests. Mrs. Black calls the doctor t
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阅读下面短文,从短文后所给的A、B、C三个选项中选出能填人相应空白处的最佳选项。 A farmer, a cleaner and an electrical engineer ( 电气工程师 ) were waiting to be killed in the electric chair. The farmer was brought to the chair (1) "Do you have anything that you wa
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完形填空 We are lucky to live in a rich country where we have many things. However, most of us usually (1) some things. Electricity is one thing that we waste most. Lights, TVS, (2) and other things are often kept on even wh
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完形填空 Electricity is very useful in our daily lives. It is said to be one of the greatest (1) in human history. It lights our world, (2) our homes, cooks our food and gives us lots of happiness. Electricity brings brightn
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Before (leave) the classroom, please close the window.
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Tom has to______ (finish) his homework first and the goes to play with others.
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When I came into my room, I heard someone______ (sing) next to my room.
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We have enough rooms______ (live) in. Don't worry about that.
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The water here is safe______ (drink).
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