所以角ACB=30 （菱形对角线平行一对对角，因为该角=60所以另一角为30）
又因为CE垂直AC
所以角BCE=60
在三角形CDB和三角形CEB中
因为角BCD=角BCE=60 角CBE=角CBD=60 CB=CB
所以三角形CDB全等三角形CEB
所以AD=DC=CE
又因为DC平行AE 且EA不平行CE
所以四边形AECD是等腰梯形
四：提示：做HY（使AH=CY）
其中测试：
一：BDB
二：4 3 5 8cm 25 12 16 246
三：
（1）3[提示：先把上面的乘进去，得根号18，再与下面的根号2结合，得根号18/2 得根号9，=3]
（2）0[提示：把根号12变出有根号3的（2倍根号3）
（3）12减二倍根号6[提示：后面是平方差公式[（AB]）（AB）=A平方B平方），前面是完全平方公式[（Ab）平方=A平方B平方2AB][A B皆是
常数]把公式代如即可求出答案]
（4）负14倍根号2 [提示：把后2项变出都根号2的（根号8=2倍根号2 7倍根号18=73倍根号2=21倍根号2）
确定位置：
一：CBA
二：北偏东60度500米处 7
三：A（1，4）B（2，3）C（3，0）D（3，0） 16
一次函数（1）：一：DAC二：（1）（2）（5）（6） 2 （1.5，0） （0，3） 增大 2.25 （0，6） 三：[1]略[2]（2/3，0）（0，2）[3]2.5 [4]当X〈
2/3 时 Y》0 当X〉2/3时Y《0
一次函数（1）
一：DAC
二：（1）（2）（5）（6）；（2）； （1.5，0）； （0，3） ；增大； 2.25； （0，6）
三：[1]略;[2]（2/3，0）（0，2）;[3]2.5 ;[4]当X〈
2/3 时 Y>0 当X〉2/3时Y<0
一次函数（2）
一：AD
二：3 [一二四] Y=2X6
三：甲 ;2/3 四：[1]10元 [2]1.2元/KG [3] 50KG
综合
一：BBBA
二：0；0 ；（1，1）； 拉伸； 4
三：17.4
二元（1）
一：DCC
二：[1]X=0.5 Y=1 [2]X=3 Y=0
三：设牛单价X元 羊单价Y元 得式子：3X2Y=3400 X5Y=3300 求得X=800 Y=500
二元（2）
一：CB
二：2 ；含未知数项； 2； 3
三：[1]X=3 Y=5 [2]N=2 M=5 四：设原来的数为10X Y 得式子：XY=7 （10XY）（10YX）
=27 求得：X=2 Y=5 既原来数为25
英语（全部）
happy1
P37.一
what a melody(悦耳) song it is!
what a fast boy he is !
what a heavy girl she is !
what a beautiful school it is !
what a good boy he is !
what a beatific(幸福) boy he is!
P37第二题
is cleaned
were taken
is made
was given
be being show
was invited
was stole,was fond...
三
turtle
tiger
japan
Mexico
tiger
sierra leone
P39.一：
Better；best havier；heaviset
more；most older；oldest
bigger；biggest more expensive；most expensive
more smart；most smart better known；best known
more badly；most badly less；leas
more carefully；most carefully fewer；fewest
more slowy；most slowy thinner；hinnest
more healthy；most healthy more easily；most easily
hotter；hoyyest oftener；oftenest
farer；farest larger；largest
P40一：
plan to do 计划做某事 He planned on taking his vacation in July.
hope to do 希望做某事 We hope to see you soon.
agree to do 同意做某事 No results found for agree to do.
refuse to do 拒绝做某事 She asked him for a loan, but he refused.
finish doing 完成某事（后面就不打某事..到时记得自己加上哈）Have you finished reading that magazine?
enjoy dong 擅长....I enjoyed reading these books very much.
practise doing 练习...I practise my swing.
suggest doing 建议..I suggest our going to the park on Sunday
admit doing.承认... I admitted breaking the window.
deny doing否认...He denied having seen these watches before.
arrange for 安排...I’ve arranged for a taxi.
offer to do 提供They offered to help me
like/lovedoing喜欢.. She likes playing the piano
hate to do 遗憾...He hated to have quarrelled with her.
hate to do 讨厌 He hated to have quarrelled with her.
remember to do 记住去做某事 Do you remember her telephone number?
remember doing 记得做过某事 I remember telling you about it once.
forget to do 忘记去做某事 I forgot posting the letter.
forget doing 忘记做过某事 Don't forget to post the letter.
P42
One man who lives in Wei kingdom goes to Handan. He thought people in Handan have very elegent ways of walking. He tried hard to learn they way Handan people walked but he failed. He tried so hardly and forgot his original Weikingdom ways of walking, so he had to crawled back home.
p43
动词 过去式 过去分词
be was been
cook cooked cooked
know knew known
swim swan swam
get got got
teach tought taught
leave left left
fell felt felt
smell smelt smelt
drive drove driven
run ran run
think thought thought
keep kept kept
，深圳市八年级《寒假作业》答案（深圳报业集团出版社）tag: 出版社 深圳市 ， 初二上册语文教案，初二上册语文教案大全，语文教学 - 中学语文 - 中学教案大全 - 苏教版 - 初二上册语文教案