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北师大初中七年级数学上册代数式教案2

  • 2022年新疆中考语文真题(原卷版)

    13. 渡荆门送别李白渡远荆门外,来从楚国游。山随平野尽,江入大荒流。月下飞天镜,云生结海楼。仍怜故乡水,万里送行舟。

  • 2022年天津市中考语文真题(解析版)

    首先,林冠层就像一把大伞,能够对垂直降雨进行再分配。一部分降水被林冠截留,直接蒸发到大气中;一部分顺着枝叶、树干流到林地,形成树干径流。据统计,我国主要森林生态系统的林冠截留率平均值为11%~34%。

  • 2021年河南省中考语文真题(解析版)

    班长立刻组织抢修舵链,这才发现,几乎不可能。修舵链要从船头的铁柱处下去,可甲板到船头的舱盖上结了厚冰,舱盖是拱形的,十多米长。平时,船一晃,在上面走都很难。现在结了冰,站都站不住,根本别想走过去。班长看着结冰的舱盖请示陪同的马参谋长:“参谋长,过不过?”“怎么过?”“爬!”“多大把握?”“没有。”马参谋长认真看了看班长,重重拍了他一下。

  • 山西省2019年中考语文真题试题

    黄花梨是极其名贵的木材,是制作高档家具的上好材料,有“鬼脸”的黄花梨更是其中的佼佼者,被视为佳品中的珍品,价值连城,受到世人的追捧。 其实,所谓“鬼脸”就是黄花梨受到伤害之后留下的疤。因为黄花梨生长于沿海地区,常遭台风袭击, 在风雨飘摇中不是被扭曲,就是被折弯,甚至被折断。尽管如此,也阻挡不了黄花梨的成长,只不过,为了弥补伤害,受伤处的纹理发生了变化,形成了各种各样惟妙惟肖的图形,有的像动物,有的像植物,有的像人物,形态各异,丰富多彩,形象逼真,十分迷人。

  • 云南省2016年中考语文真题(含解析)

    行路难李白金樽清酒斗十千,玉盘珍羞直万钱。停杯投箸不能食,拔剑四顾心茫然。被渡黄河冰塞川,将登太行雪满山。闲来垂钓碧溪上,忽复乘舟梦日边,行路难!行路难!多歧路,今安在?长风破浪会有时,直挂云帆济沧海。

  • 2022年海南省中考英语真题(解析版)

    In the late autumn, John was badly ill andbecame bedridden (长期卧床的).After the doctor visited John several times, he told Sue, “His condition isquite ___22___.John seems to have lost all will to live. If he doesn’t want to live, medicineswill not help him.”

  • 2022年海南省中考英语真题(原卷版)

    YangHongwei, 56, was born into a kite-making family in Weifang. When she was young,she often saw kites with bright colors and different shapes in hergrandfather’s workshop.

  • 2022年河南省中考英语真题(原卷版)

    In the large yard stood thirteen trees ofdifferent sizes. One day, while Joey was playing with his sister under thetrees, he noticed that a tree trunk (树干) had a sad look. He raninto the house to tell his mom about it. She told Joey to find the reason whyit was sad.

  • 2022年江西省中考英语真题(原卷版)

    Long ago, a poor old couple lived on the coast.One day, an old storyteller came to their village. The old couple gave him ameal. In return, he gave them a coffee mill (磨粉机)and said, “Say, ‘Mill, please grind (磨粉)’,”

  • 2022年河南省中考英语真题(解析版)

    In the large yard stood thirteen trees ofdifferent sizes. One day, while Joey was playing with his sister under thetrees, he noticed that a tree trunk (树干) had a sad look. He raninto the house to tell his mom about it. She told Joey to find the reason whyit was sad.

  • 2022年江西省中考英语真题(解析版)

    The app — called Sit With Us — is ___15___. If a student is having lunch in the afternoon,he or she can create an invitation. Other students can open the app and ___16___ that invitation. They can then use the app todecide when and where to ___17___.

  • 2022年福建省中考英语真题(原卷版)

    Thinking that her dream could never come true,Kelly was in low spirits and ____18____ her studies at school. Hermother did all she could to cheer her up, ____19____ Kelly refused tochange. She even took out all her anger and ____20____ on her mother.

  • 2022年福建省中考英语真题(解析版)

    At the age of nine, Kelly dreamed of being abasketball player. But one day when she was playing basketball, she hurt herleft leg ____16____.

  • 2022年安徽省中考英语真题(解析版)

    Antarctica lies in the most southern part of theworld. It is the coldest area on Earth. There isn’t much rain, but there is alot of snow and wind. The lowest temperature was on 21 July in 1983 at -89.2℃!

  • 2022年安徽省中考英语真题(原卷版)

    During 1907-1909, British explorer EarnestShackleton explored Antarctica on foot. In 1911, two explorers—a British mannamed Scott and a Norwegian named Amundsen—raced 1, 400 kilometres to the SouthPole (南极).Amundsen arrived first.

  • 2022年吉林省中考英语真题(原卷版)

    Taiping nijiaojiao is made of the mudfrom the local mountain. It takes more than ten steps to make the clay toy, andthe key step is to knead (捏) it with your hands. You can knead the clay toyinto anything, like animals and plants. The blowhole is the most difficult partto make, for the size of the blowhole makes a difference to the sound. Whilecoloring, you can use traditional cultural elements (元素) thatcarry good meanings. It’s hard to make taipingnijiaojiao. But when you finally make it, you will feel proud of yourself.

  • 2022年吉林省中考英语真题(解析版)

    “Red Trip” in TonghuaTonghua is a good choice to have a “red trip”. It is aplace full of “red stories”. The well-known national hero Yang Jingyu oncefought here. Experience the “red spirit”!

  • 陕西省2019年中考语文真题试题

    一般人在一个完整的夜间睡眠中,大脑在进行着具有一定周期性的功能和状态循环。依据多导睡眠图描绘的脑电图模式、眼动和肌张力特征,人的睡眠结构可以分为两种类型:非快速眼动睡眠和快速眼动睡眠。非快速眼动睡眠与快速眼动睡眠循环交替一次称为一个睡眠周期。每次夜晚的睡眠通常有4~5个睡眠周期,每个周期约90~110分钟。两个睡眠周期之间通常伴有短暂觉醒,整夜大概出现4~6次。

  • 河南省2019年中考语文真题试题

    做一粒“读书种子”,让阅读成为一种力量,推动文化传统薪火相传,可以说正是读书人的自我期许。从“每有会意,便欣然忘食”的陶渊明,到“读书破万卷,下笔如有神”的杜甫,再到“不是老夫朝不食,半山绝句当朝餐”的杨万里,无不是“读书种子”的精彩写照。读书滋养美好心灵,可以遇见更好的自己,看到更美的世界。所谓“耕读传家久,诗书继世长”,重视学习、重视诗书,千百年来融入中国人的血脉里,成为中国特有的文化禀赋。

  • 江西省2019年中考语文真题试题

    人,说着就会慢慢儿长大的。坡里移来的小桃树,在菜园里都长满了-握。姐姐出阁了呢。那远远的山庄里,土财主。每次搬回来住娘家,母亲和我们弟弟,总是于夕阳的辉照中,在庄头眺望的。远远听见了銮铃声响,隔着疏疏的杨柳,隐约望见了在马上招手的客人,母亲总禁不住先喜欢得落泪,我们也快活得像几只鸟,叫着跑着迎上去。问着好,从伙计的手中接过马辔来,姐姐总说:“又长高了。”车门口,也是彼此问着好:客人尽管是一-边笑着,偷回首却是满手帕的泪。

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