5.2求解二元一次方程组(1)基础导练1在方程 中,用 x表示 y应为_,用 y表示 x应为_321xy2在解方程组 时,我们可设 , ,此时方程组将变形4()3()27ab aby为 3一个两位数的两个数字之和为7,两个数字之差为3,则此两位数为 4已知 , 都是方程 的解,则 , 01xy48a
2018年秋人教版八年级英语上Unit1课时训练题二含答案Tag内容描述:
1、5.2求解二元一次方程组(1)基础导练1在方程 中,用 x表示 y应为_,用 y表示 x应为_321xy2在解方程组 时,我们可设 , ,此时方程组将变形4()3()27ab aby为 3一个两位数的两个数字之和为7,两个数字之差为3,则此两位数为 4已知 , 都是方程 的解,则 , 01xy48axbyab5已知方程组 ,指出下列方法中比较简洁的解法是( )53xA利用,用含 x的式子表示 y,再代入B利用,用含 y的式子表示 x,再代入C利用,用含 x的式子表示 y,再代入D利用,用含 y的式子表示 x,再代入6解方程组 的最好方法是( )34791025mnA由得 ,再代入 B由得 ,再代入10。
2、2.7二次根式(1)基础导练1. 使式子 有意义的条件是 。4x2. 当 时, 有意义。_21xx3. 若 有意义,则 的取值范围是 。1mm4. 当 时, 是二次根式。x2x5. 在实数范围内分解因式: 。429_,_x6. 若 ,则 的取值范围是 。24xx7. 已知 ,则 的取值范围是 。8. 化简: 的结果是 。21x9. 当 时, 。1525_x10. 把 的根号外的因式移到根号内等于 。a11. 使等式 成立的条件是 。11xxA12. 若 与 互为相反数,则 。ab24b205_ab13. 在式子 中,二次根式有230,1,1,2xyxxy( )A. 2个 B. 3个 C. 4个 D. 5。
3、Unit 1 Where did you go on vacation ?基础导练1、用所给词的适当形式填空。1. Kevin (watch)TV every evening.2. I am (arrive)in Beijing at 8:00 tomorrow.3. He (go)to the movies yesterday.4. It (rain)heavily last Sunday.5. The musician (seem) to write a new song last month.2、单项填空。( )1. he is ill, he goes to school. A. Although; but B. /; / C. Although; / D. But; although ( )2. They watch TV . A. one a week B. once a week C. one the week D. on ce week ( )3. The old man is well 。
4、Unit 1 Where did you go on vacation ?基础导练一、用所给单词的适当形式填空。1. When did you go _(shop)?At 8:00 p m. yesterday evening.2. He seemed _ (be) tired in cla ss.3. I felt very nervous in the classroom, because I didnt know _ (someone)4. The trip to Hangzhou was very _ (wonder)5. Why did you eat _ (something) for breakfast?Because I got up too late.来2、单项填空。( )1. There are _ people on the bus.A. too many B. many tooC. to o much D. much 。
5、Unit 1 Where did you go on vacation ?基础导练1、用所给词的适当形式填空。1. They ( not go )to the m ovies last night.2. Bill and Jim dislike (speak)English.3. I decided (play)soccer yesterday.4. We were wet and cold because we forgot (bring)an umbrella.5. I enjoy (swim)in summer.二、根据汉语提示完成句子。1. There are _(相当多) books on her bookcase.2. _(当然) there are lots of interesting animals in the zoo.3. Every year he and his friends _(去夏令营)4. Where did you go o。