问题 解答题
(1)x2+2=3x;
(2)(x-1)(x+2)=70;
(3)(y+3)2-2=0;
(4)(3x-2)2=2(2-x);
(5)(x+7)(x-7)=2x-50;
(6)(3-2
2
)x2+2(
2
-1)x-1=0
答案

(1)移项,得x2+2-3x=0,

即(x-1)(x-2)=0

∴x-1=0或x-2=0

解得x1=1,x2=2.

(2)整理(x-1)(x+2)=70,得

x2+x-72=0,即(x-8)(x+9)=0

∴x-8=0或x+9=0

解得x1=-9,x2=8.

(3)移项,得(y+3)2=2,

∴y+3=±

2

解得y=-3±

2

(4)整理(3x-2)2=2(2-x),得

9x2-10x=0,即x(9x-10)=0

∴x1=0,x2=

10
9

(5)整理(x+7)(x-7)=2x-50,得

x2-2x+1=0,即(x-1)2=0

∴x-1=0

∴x1=x2=1.

(6)由(3-2

2
)x2+2(
2
-1)x-1=0,得

[(3-2

2
)x+1](x-1)=0

∴(3-2

2
)x+1=0或x-1=0

解得x1=1,x2=-3-2

2

阅读理解

Wang Hao and Wang Liqin, two of China’s top table tennis players, both saw the World Table Tennis Championships(世锦赛) as a chance to prove themselves. But there was only one trophy(奖杯) and Wang Hao, 25, won it last Tuesday in Yokohama(横滨), Japan.

Wang Hao, who won the men’s doubles title(对打) with Chen Qi last Monday, played with spirit to beat Wang Liqin.

Wang Hao said it was his mental toughness(心理韧性) that made the difference. “I was disappointed(失望) by my performances in past championships and the last two Olympic Games. But I have tried to pull myself together and prepared well. This is the result.”

Wang Hao said he has always understood the importance of physical training(体能训练) and technical skills(技巧). Now he knows the need for mental preparation as well. Having two Olympics silvers(银牌) had left him feeling bitter(辛苦的). The bitterness perhaps explains why he has not always played at his best in the past.

“I’ve come to understand that you can learn important lessons from failure,” he said. “Losing can build your character and make you a stronger player.” His next goal, or dream, is to win the gold medal at the London Olympics in 2012.

Liu Guoliang, head coach of China’s table tennis team, sang the praises of Wang Hao’s victory. “This is just the beginning of his rise,” said Liu. “it’s the confidence-booster(信心) he needs to make further progress.”

小题1: Who won the trophy of the World Table Tennis Championships?

A.Wang Liqin.

B.Wang Hao.

C.Both of them.

D.Neither of them.小题2:Which of the following is correct about Wang Hao?

A.He won the last two Olympic Games and the past championships.

B.He won the past championships but lost the last two Olympic Games.

C.He won the last two Olympic Games but lost the past championships.

D.He lost the last two Olympic Games and the past championships.小题3: According to Wang Hao, he won the match because of ________.

A.his mental toughness

B.his technical skills

C.his physical training

D.his good luck小题4: If Wang Hao would like to make further progress, he should ________.

A.take more physical training

B.improve his technical skills

C.keep the bitter feeling

D.be a confident man

单项选择题

東京外国為替市場は午前9時に開き、前場は12時に終わります。後場は午後1時30分に始まり、3時30分( A )取引が続きます。東京市場の活性化策の一つ( B )1995年に取引時間の制限は廃止されましたが、慣行として残っており、12時から1時30分の昼時の取引も期待した( C )はないようです。海外の市場は段々と取引が増えていく、( D )取引をする銀行の数が増えていき、それから段々と取引が減っていって終わる、という具合です。外国為替取引は二つの銀行があれば成立する( E )ですから、実務的にはこのほうが自然です。東京市場の外国為替取引量は1日で1280億ドルで、世界ではロンドン市場、ニューヨーク市場に( F )規模です。取引の内容を見ると、前回調査時と( G )減少したとはいえ、顧客取引が全体の約2割です。海外市場では顧客取引が全体の1割にも満たないことを考えると、東京での顧客の役割の( H )がわかります。したがって、外国為替レートの動向を読むときにも、顧客の動きを知ることが東京では大事になります。通貨別では全体の7割をドル対円の取引が占め、次いでドル対マルクが1割、残りをポンド、スイスフランなどが占めています。しかし最近ではドル対マルクの取引量が急増して、円の取引量と「肩を並べる」日も出てきました。どこの海外市場もドル対マルクの取引は主流なので、東京もようやく海外市場並みになりつつあるということでしょうか。

( H )に入る言葉はどれですか。

A.大きさ

B.重要

C.十分

D.必要