a²－1分之4a+(1-a)分之1+a的结果及过程

a²－1分之4a+(1-a)分之1+a的结果及过程
a²－1分之4a+(1-a)分之1+a的结果及过程

a²－1分之4a+(1-a)分之1+a的结果及过程
4a/（a^2-1）+(a+1)/(1-a)
=4a/（a^2-1）-(a+1)/(a-1)
=(4a-a^2-2a-1)/(a^2-1)
=-(a^2-2a-1)/(a^2-1)
=-(a-1)^2/(a^2-1)
=(1-a)/(a+1)

第一单元：
DDDABCBCBC
CDBACACDCB
CABDB CAABB CABCD
Weekends; result; sleep; although; difference; less; habit; maybe; never; same
Reading; keeps; twice; health; helps; to stay; to s...

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第一单元：
DDDABCBCBC
CDBACACDCB
CABDB CAABB CABCD
Weekends; result; sleep; although; difference; less; habit; maybe; never; same
Reading; keeps; twice; health; helps; to stay; to speak; finishing; active; watch
Drinking...health; don't...times; different from; same as...; as for...
Tom doesn't do his homework at school.
Do you usually have lunch at home?
What does your brother do?
How often do you shop?
Who is your favorite writer?
I'm relaxing at home.
Are you staying there?
How often do you...
When
...have a relaxed..
B, D, E, C, A
第二单元
BDDBABCBBB
ACAACCABDA
ABADD BADCD
Nose; dentist; tried; medicine; teeth; sore back, hungry, staying, eyes, moment
Illness; go; lots; had; to study; is singing; is, balanced, is swimming, cleans
Does... Have
What's... With..
Shouldn't...any
What should...do..
It ...to play...
Will... Go...
Are you...
When will...go...
What...
Enjoys himself...
Help... To ..
Told... To
...try to...
...be too tired...make...
..important to sleep...
D, C, G,E, B,
第三单元
A, B, B, C, C, A, B, A, C, A
A,B, B, A, C, B, A, B, A, C
B, A, C, A, C
Where are you going
What are you going to do there?
Where are you going..
How long will stay there?
That sounds good.
...a walk
...hires videos..
...spend...in sightseeing...
...there are...speak...
...for... Leave for...
第四单元
ACBCBCCBCA
BCABDADBAC
BAACB
...flies; does come; doing; to surf; ill;
...a lot more...taking; take..to; takes...to watch...; hour's driving; sounds like...
How long did it...
How do...
He takes...
..taking.. Bus
...what time..
第五单元
DADCBCABBA
CBDCCBADBB
BCBBC
DCEAB
...be handed in in time..
...have to go back...
How about...fishing...
...have to...geography..
...very busy...
第六单元
ABBADADCCB
BCBACAACBB
DCDDB
..both; same; laugh; calm; popular
第七单元：
选择DADDCADDBB
完形填空BBCACDBDB
阅读理BDC
Bings you coffee
If you can't eat up all the food and you need to take it home.
填空
Peel
Mix
Add
Relish
Recipe
第八单元
DACABBCDBB
BBCACDBAB
DADBC
There wasn't any water in the pool last year.
They had a good time at the zoo
How was... About
What did you do this Monday?
Go to school by taxi
第九单元
BADCAACBDC
BCADCDABDB
ACABD
Born; interesting; clever; lovely; alphabet;
...learned...skating on the ice at...
...began to learn
...take part in...
...can...she was five
...stopped smoking...
第十单元
B,A,C, C, B, D, A,D, C, C
C, B, A, C, DC, B, C, A, D
D, A, D, A, D
Will be; eating; healthy; differences; interesting
...wants to communicate better with...
...find...to work as a ...
...made plans for the new year...
...write ... International magazines...a little...
...to be.. Reporter...because.. Like talking with...
第十一单元
B, B, B, B, B,C, D, A, D, D
A, B,A,A,C,B,A,A,B,C
A,B, C, A, D
Could... Clean..
...take care...
...doing housework...
...invite to...
...Mine ...left
...throw away the rubbish...
...go and see movies...
...washing...dishes...
...make the bed...
... Sweep the floor...
...enjoy themselves...
...buying something to drink...
...more than others...
...how delicious the chicken is...
...does... Like doing?
第十二单元
B, D, B, D, B, D, C, B, B, A
C, A, D, B,A, D, A, C, D,B,
B, A, D, A, B
; ; quality; best; fastest
... The most interesting; the newest; more; friendly; tall
专题训练
完形填空
。From, topic, its , means, stand, successfully,were, as, wants, hometown,
, C, B, C, D,D, A, A, D, A, B,
, C, B, D, A, B, A, A, C, B, D
, B, C, B, A, C, D, A, B, C, D
, B, C, A, D, D, A, C, B, A,C
, A, B, B, B, B, B, C, D, C, A
A, A, C, B, C, D, B, A, B, C, A, D, B, A, C
阅读理解
. B, C, B, A, D,
. B, A, C, B, D
. F, F, T, F, T
. Because people were beginning to worry about what we were doing to our environment.
22 April
Turn off
No.
Go to school on foot or by bus instead of by car.
. C, D, D, D, A
词句及交际运用
Collecting, well, yourself, friendly, ninth, believe, place, vocation, already, weather
To write, are grown, badly, saying, to lock, be put, was made, is taught, will be, was designed
...dangerous... the way home; different from...; in this way...; in the end...; as years passed by...; spend too much time on...; one of the best; with the help of...;
...enjoy yourself...; did you finish...; do you...; what... He is; didn't go; too...to..; ...for giving us...
A)...for; going; how; by; by; busy; long; on; or; have
B)...corner; carefully; stop; until; right; switched; difference; drive, accidents; safe
...i haven't seen you...
...how long have you been there?
...wonderful...
...haven't you...
...thank you...
...have, time,spend, sea, like, cool, and
...B, F, E, A, C
... D, C, E, F, B
...
综合训练
B, C, C, C, C, D, A, C, B, A, A, C, C, B, D
B, B, A,C, B, D, A, C, D, A
A). D, A, B, C
B). D, A, B, A, B
D, F, A, C, E
...happened, was caused, who smoked, fought, was put, lasted, were hurt, not to play, know, to play
The farthest, success, practising, been dead, caught up with, bridges, fatter, drinking, is famous for, tried her best
...did you see...
...how much...
...too..to...
...borrowed...from,
...i can't
When he was 17...
...well-known
...April 7th,1954
...a cook.
...he learned how to do stunts...
八年级下
能力拔高：
C, D, D, A, D
Surprised; planning ; argue; impossible; modern; including; governess
Themselves; building; to buy; human being; companies; him; not to play;
Will go; will you, what will, won't keep, how soon, writes to, the matter
His dream came true last year.
...They planed to do more work with less money and fewer people.
.. There are robots doing housework in some families.
...Don't worry, she will be home as soon as possible.
..Mrs. Zhang complains about doing too much housework.
B, A, B, C, C

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