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七年计算题

发布时间:2014-01-26 10:58:58  

一、计算题

7737212?[(?2)?(?5)]?(?1)?2?(?3) 81258512

1131?(?1)?(?3)?0.25?(?3.75)?4.5 244

311(?)?(8?1)?0.04?3 435

453553?(?)?(?)?(?)??(?1) 513513135

4?1??1???3??2???3??(?0.25) 5?8??3?

二、化简题

2ax?3by?4ax?3by?2ax

?2x2?x?3?x2?3x

3x2y?xy2?2x2y?3xy2

xn?2xn?1?xn?2?2xn?2?3xn?xn?1

3x?2x2?2?15x2?1?5x

一、计算题

?19

222?(?) 235

3535(?2)3?53?(?)?(?1)?[(?)?]?(?1)2000 5757

112131??(?)????2?3? 22250.2?0.325

1?1?1?2??12??10???8??3? 3?3?3?3?

?3?2???3?5??7??7???? ?8?38??????

二、化简题

(2x2?5x?1)?2(3x2?x?5)?3(x2?2x?7)

3x2?2xy?4y2?3xy?4y2?3x2;

?7x2?6x2?5xy?23y2?xy?x2; ????

2?2x2?5x??5?3x?5?2x2?

A?4x2?4xy?y2,B?x2?xy?5y2,求:A-3B

一、计算题

?1.5?1.4?4.3?5.2?3.6

??6????11?

?3?2??

????0.5?11??1?

3?6?????24??

?2.5?7.3?2.5?(?2.4)?2.5?(?1.7)

??3???3???5??1?0.2?????2?? 5????

二、化简题

3x3?x3?6x2?7x?2x3?3x2?4x ??????

12?23??82?x??3x?3xy?y2???x2?3xy?y2?35??35? ?

?2x

3?3x2y?2xy2?x3?2xy2?y3??x3?3x2y?y3?????

一个多项式减3x?2x?1得5x?4x?2,求这个多项式。

22

一、计算题

1?14??2?(?3)2 6??

(?4)?(?)?30?(?6) 23

4

?1134?????????60? ?2345?

1?5??5?15?1?3?????????2????? 2?7??7?27?2?

?2????3?3?

33???3????3? 22

二、化简题

1st?3st?6; 2

8a?a3?a2?4a3?a2?7a?6;

7xy?xy3?4?6x?

23xy?5xy?3. 5

2(2a-3b)+3(2b-3a)

(2x2?xy)?3(2x2?3xy)?2x2(2x2?xy?y2)

??

一、计算题

3?1??1?2???8????2??0.25?1.5?2.75 4?2??4?

?377??7??7??377? ?1?????????????1????4812??8??8??4812?

131?3?1?; 842

4151??0.8?1; 566

17

31?6.25?8?0.75; 42

二、化简题

2x3?4x?1

3x2?(x?3x2?2x3),其中x??3;

1

2a2b?5ac?(3a2c?a2b)?(3ac?4a2c),其中a

7-3x-4x2+4x-8x2-15

2(2a2-9b)-3(-4a2+b)

3a2b-[2ab2-2(ab-1.5a2b)+ab]+3ab2

2,c??2.??1,b?

一、计算题

?

11111???? 23456

2?2?8?3????2?????1??0.75 5?5?21?4?

-1-[1-(1-0.6÷3)]×[2-(-3)×(-4)]

?2?1?1?5??2???3????4?????0.2? 3?2?3??

?1????2??1?4??9???0.8??5???? ????295????????

二、化简题

7xy?x2?2x2?5xy?3x2

5?a2b?2ab2?c??4?2c?3a2b?ab2?

?x

2?2y2?z2????y2?3x2?z2???5x2?y2?2z2?

22?2a2b??3abc?4ab?ab????? ??

?ab?6????8a?7b,其中a??1,b??2. ?23?

一、计算题 ??2? 33?3??5???3?5??5???????1??????????5??7???5?7???1?2000

??3?

31?2?1?2??2?????4?2???? 4?3?2?3?

42????12??6?53

??3?2?24???3????5?。 3

0÷(-4)-42-(-8)÷(-1)3

-32-(-3) 2-(-3)3+(-1)6;

二、化简题

4a2b?3a2b?12ab 2

3x2?3x2?y2?5y?x2?5y?y2

?8ab?5ab??2?3ab?4ab? 2222

(a2?ab)?4?2a2?3ab??2a2?(2a2?ab?b2) ??

5a3?3b2?5a3?4b2?2ab ????

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