Question

英语数学题目，懂的进，要完整解答+正确率=积分给~~

1、已知x、y是有理数，且 | 3x – 4 | + (3y + 7 )² = 0，求：
(1) x² + y² (2) x²– 2xy + y²

2、某校六（1）班在春游分组时，同学们作这样安排各中队长任春游小组长，每人负责7名同学。,这样有一组人数不足,若每组减少一人则多余3人，已知六（1）班人数在30～50之间,问该班总人数可能是多少？

3、棱长分别为3厘米，5厘米，4厘米的两个长方体拼凑成一个长方体，它们的表面积最多减少多少平方厘米？

4、已知长方体的长，宽，高之比是5：4：3，用一根长为240厘米的铁丝，制作这个长方体的模型，求此长方体的表面积。

5、一个角的补角与它的余角之比为3∶1，求这个角的度数。

6、线段AB=54cm，C是AB的中点，D是AC上的一点，且CD=2AD，E是BC的中点，求线段DE的长.

( )1. A lot of land becomes deserts because many trees are ____ by people.
A. cut off B. cut in C. cut back D. cut down
( )2. The police are trying to ____ the real murderer.
A. see B. look C. find out D. watch
( )3. The company promises to ____ a meal for each worker.
A. bring B. Provide C. have D. take
( )4. — ____ can we save water?
— By turning off a running tap.
A. When B. Why C. Where D. How
( )5. — How are you feeling today? — ____.
A. I don’t like it B. Thank you
C. Not too bad, thanks D. I’m sorry to hear that
( )6. Let’s the menu first.
A. have a look B. look C. have a look at D. see
( )7.There are many things in the supermarket. will you go to first?
A. Where B. Which section C. What D. When
( )8. Mr Smith has ____ 8-year-old daughter who is very lovely.
A. a B. an C. the D. /
( )9. Mr White has more money than Mr Black. But he doesn’t enjoy ____.
A. himself B. him C. his D. he
( )10. Kitty won first prize in the English contest. Her parents are proud ____ her.
A. from B. of C. at D. to

完形填空
The earth is our home. We must take good care of it. That is to say we must (1)k_________ the land, air and water clean.
But man began to (2)p__________ the earth when he first made a fire, washed his clothes in the river and threw dirty things onto the ground. Many years ago, pollution was not so serious(严重的) because there were not so many (3)p__________. There was enough clean air, land and water. When the land or the river was dirty in one place, man moved to (4)a___________ place. But now man is slowly polluting the whole world and there is (5)n__________ enough clean air nor clean land. The more people in one place, the more (6)p____________ there will be.
When is this all to end? Is it possible to get rid of(消除) pollution? We are (7)g____________ to say that people have come to know the danger of pollution and a large number of them are working hard to protect our earth.

数学应用题要过程哦~~
英语选择题不要ABCD乱写~~~
好的我加分哦~~~

Answer 1

数学题
1.依题意，3x-4=0,3y+7=0, 则x=4/3，y=-7/3，则x^2+y^2=65/9,x^2-2xy+y^2=(x-y)^2=(4/3+7/3)^2=121/9
2.可能是31，38，45。设一共分成x个小组，则全班一共有7x+3个，得到30<=7x+3<=50,27/7<=x<=47,x可取4.5.6,则全班可能有31，38，45人，但如果每组7人加上队长，一共是8人，有一组不够人，说明这一组可能是1，2，3，4，5，6，7人，而31，38，45都满足
3.最多减少了40平方厘米，因为这个长方体的最大的面的面积是20，叠在一起就少了40平方厘米
4.这个长方体的周长为240/4=60厘米，又长，宽，高之比是5：4：3，所以长为25，宽为20，高为15，则这个长方体的表面积为2（25*20+25*15+20*15）=2350
5.解：设这个角为x度。则180-x=3(90-x),x=45,即这个角是45°。
6.DE=31.5.AC=54/2=27,CD=2AD,CD=18,CE=27/2=13.5.DE=CD+CE=31.5
英语
1.选D.cut down意思是砍倒，把原句翻译为许多的陆地变成沙漠的原因是因为很多树木被砍倒
2.选C.find out的意思是找出，把原句翻译为警察试图找出谋杀者
3.选B.因为provide是提供的意思
4.选D.因为它是问方式用how
5.选C.第一句问你今天感觉怎样了，下面回答好多了，谢谢，所以选C
6.选D.
7.选B.是问商场有很多东西，你先去那部分
8.选B.用an
9.选A.enjoy oneself,过的不愉快
10.选B.be proud of sb.,为某人感到骄傲
1keep 2pollute 3people 4another 5neither 6pollution 7glad

Answer 2

1题，因为| 3x – 4 | 和(3y + 7 )²均为非负数，推出3x-4=0,3y+7=0
故x=4/3，y=-7/3
底下的您自己带进去算吧
2题， 用方程不太好解，这样，设总人数为x，x/7=整数余3
这样您挨个试31，38，45都符合
3题，两长方体的总表面积为（3*4*5）*2=120平方厘米
要想使合并后的几何体表面积最小，就要合并最大的两个面，即
表面积为120-（5*4）*2=80平方厘米
4题，240厘米为总棱长设长宽高分别为5x，4x，3x可得方程
240=2*(5x+4x+3x)得x=10
所以表面积为2*（50*40+50*30+40*30）=9400平方厘米
5题，设角度为x，
则（180-x）/（90-X）=3/1
得x=45度
6题，AB=54,得AC=27，
由CD=2AD,CD+AD=AC=27，得
CD=18,又因为CE=BC/2=27
得DE=CD+CE=45厘米

英语
1D
2C
3B
4D
5C
6不会
7B
8B
9A
10D

1keep
2pollute
3people
4another
5neither
6pollution
7glad

Answer 3

数学部分
1.根据绝对值>=0,()^2>=0 ，又因为两者和为零 说明| 3x – 4 | =0，(3y + 7 )² = 0 （因为两个大于零的数字加起来不可能等于零 只有两个都是零才能相加为零） 然后解得 x=4/3 y=-3/7 将两个结果带入（1）和（2） 解得(1) x² + y²=65/9 （2）x²– 2xy + y²=121/9

Answer 4

1D 2C 3B 4D 5C 6D 7B 8B 9A 10B
1keep 2pollute 3people 4another 5neither 6pollution 7glad

Answer 5

数学有人弄了，我来试一下英语的，我就一家之言，只供参考了
1d cut down 砍伐砍掉的意思
2c find out 寻找找到的意思，强调的是过程
3b provide 固定搭配
4d how 有对话可知表示的是方式
5c 习惯用语
6c look at 固定搭配
7b 由will you go to ，to后接名词故选b
8B 8是一元音开头的词
9a enjioy oneself 固定搭配
10b be proud of sb 固定搭配
完形填空
（1）keep，保持维持的意思
（2）pollute 污染，破坏的意思
（3）people人们，人类
（4）another 其他的另外的
（5）neither 不用解释
（6）pollution 根据上下文可知
（7）glad 高兴，开心

Answer 6

1D 2C 3B 4D 5C 6D 7B 8B 9A 10B
1keep 2pollute 3people 4another 5neither 6pollution 7glad