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

1.解：依题意得 3X-4=0 3y + 7=0
则X=3分之4 Y=-3分之7
则x² + y²=9分之65 x²– 2xy + y²=3分之31

Answer 2

1.因为| 3x – 4 | + (3y + 7 )² = 0，所以 3x – 4=0，x=3分之4，3y + 7=0，y=负3分之7