書店新到一批書，第一天賣出90本，占總數的100分之10，第二天又賣出總數的4分之1，第二天賣出多少本？請，

90除以10%等於900
900乘以4分之1等於225
225本

在一個長方形裏畫一個最大的三角形，這個三角形的面積等於長方形面積的一半.______.（判斷對錯）

在一個長方形內畫一個最大的三角形，最大的三角形的底=長方形的長，最大的三角形的高=長方形的寬，長方形的面積=長×寬，最大的三角形的面積=底×高÷2=長×寬=長方形面積÷2；所以這個三角形的面積是長方形面積的一半說法正確.故答案為：√.

期待做某事翻譯成英文短語是什麼

expectsb.todo sth.
look forward to doing sth.
hope to do sth.

把一個長方體截去一個高為8釐米的長方體後，剩下的部分是一個正方體.正方體的表面積比原來長方體的表面積减少320平方釐米.求原來長方體的表面積.

原來長方體的長和寬是：320÷4÷8=80÷8=10（釐米）10×10×6+320=600+320=920（平方釐米）答：原來長方體的表面積是920平方釐米.

棱長為2的正方體ABCD-A1B1C1D1中，M是棱AA1的中點，過C，M，D1作正方體的截面
截面圖形是什麼？為什麼？
2.截面的面積？

是梯形.
設AB中點為N，則截面是梯形MNCD1.
這是由於MN//A1B//D1C，的以M、N、C、D1共面.
因為正方體棱長為2，
所以CD1=2√2，MN=1/2*CD1=√2，
過M作MP丄CD1於P，則D1P=1/2*（CD1-MN）=√2/2，
囙此由畢氏定理得MP=√（MD1^2-D1P^2）=√（5-1/2）=3√2/2，
所以S截面=1/2*（MN+CD1）*MP=1/2*（√2+2√2）*3√2/2=9/2 .

how to make dumplings高一英語作文

How to Make Dumplings
Chinese food is very famous in many countries. One of the most special and traditional food is dumpling. Dumplings are not only tasted good but also easy to make.
The first step is to make the filling. You can choose what you favorite，such as pork，beef，or chicken. Take what you like from the refrigerator，and do not forget to close it. Then chop it up and add some chopped cabbage or green vegetables. Take a big bowl from the cupboard and put all the meat and vegetables in it. You should also put in someseasonings such salt，soy source，pepper，sesame oil，and chopped ginger to get your favorite flavor. But be careful that do not put in too much of it，which would make the dumplings disgusting. And then you can get a pair of chopsticks from the cabinet to stir the filling to evenly mix.
Put the bowl aside and do the second part. Take out the dough pieces you bought from the supermarket. They can also be made by hand，but it is more complicated，so I advice you to buy some from the supermarket. Then is the step of folding the dough pieces to make dumplings. You should hold a dough with your left or right hand and put a suitable mount of filling onto the central part of the piece with another hand. And wrap the piece into half-moon shaped and seal the edges.
In this way you make the dumpling one by one. Then pour about one liter water in a pot and heat it up. When the water is boiling，put the dumplings in it. And after them float in the water，stop the heating and get out the dumplings with a big spoon after two minutes.
In this way，you can enjoy the delicious dumplings. Be careful that you should press the edge of the dumplings firmly，in case the dumplings broke when you cook them.

作文有哪幾類？

記敘文、說明文、議論文等是就文章的題材來說的，或者說是就文章所用的主要表達方式來說的，文章主要運用記敘的表達方式，就叫記敘文，主要運用說明的表達方式，就叫說明文，主要運用議論的表達方式，就叫議論文.而寫人、寫…

△abc是等邊三角形，D是AB的中點，E在AC上，AE:EC=1:3，則∠ADE=

30
作AC的中點F
聯接DF
根據中位線定理可知
DF=1/2BC=1/2AB=AD=AE
所以三角形ADF為等邊三角形
因為AE:CE=1:3
所以AE:EF=1:1
所以E點比特AF中點，根據三線合一
所以DE為△ADF角平分線
所以∠ADE=30°

用適當的介詞填空in /on /under /behind/ to/ of /next to
A cat is the tree
Many bananas are the tree
Some pictures are the wall
Li Lei is duty today
I can't see thedog.It's the door
A red bike is the tree
Who's the photo
There is a door the wall
Welcome Hangzhou
This is a photo my family

1.in the tree外來物
2.on the tree長在樹上
3.on the wall照片在牆上
4.on duty值日
5.behind the door.在門後面
6.under the tree在樹下麵
7.in the photo在照片中
8.in the wall牆裏有扇門
9.welcome to歡迎來杭州
10.of我家的照片

指沒有能力去做好某件事情、解决某個問題.詞語吸引人們的注意.詞語

指沒有能力去做好某件事情、解决某個問題無能為力
吸引人們的注意引人注目

書店新到一批書，第一天賣出90本，占總數的100分之10，第二天又賣出總數的4分之1，第二天賣出多少本？ 請，