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初一数学计算题练习

发布时间:2014-01-09 15:52:17  

4x+3=2(x-1)+1

77(13??3)?4828x?1x?24?x ??362 (?1)32?[(?2)3?32]?(?)

4x?3(20?x)?3

3?x?6?1

x?13?2x??136x-7=4x-5 2

3(?4)2?(?)?30?(?6) 4

2332先化简,再求值:(5a+2a-3+4a)-(-a+4a+2a),其中a=1

1

23(?4)??8?(?3)3?(?3) 42?(?)?(?)?(?0.25) 34

42?23??(?)2?(?1)4 7a?5b?(15a?b) 93

?3(2x2?xy)?4(x2?xy?6)

先化简,再求值:

111(?4a2?2a?8)?(a?1),其中a? 422

112514117(?2)?[(?)2?()3]?|?|?(?5) 9?(?15)?(2.5??3?1) 22425828

当x??

1,y??3时,求代数式3(x2?2xy)?[3x2?2y?2(xy?y)]的值。 2

2

1

(?2)3?2?(?4)? ?103?[(?4)2?(1?32)?2]

4

化简求值: 5a?[3a?2(2a?3)?4a],其中a??2

2

1 ?20?(?14)?(?18)?13

2(3y?1)?7(y?2)?3

(-8)+10+2+(-1) 5+(

(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.5

2

?1.6?[(?2

)2?(?3)33

?(?2)2]x3x?15x?3?2?4?

3

6

-6)+3+9+(-4)+(-7) 112+(-23)+4

5+(-12)+(-3

)

3

(-17)+59+(-37) (-18.65)+(-6.15)+18.15+6.15

(-4111112)+(-3)+6+(-2) (-0.5)+3+2.75+(-5) 332442

(-1.9)+3.6+(-10.1)+1.4 (-7)+(+11)+(-13)+9

333821192+(-2.16)+9+(-3) 49+(-78.21)+27+(-21.79) 1111252121

先化简再求值:4ab+(-2ab+5ab)-2(3ab-ab),其中a=-1,b=-

222222 3

4x-3(5-x)=6 x-3x-4-=1 53

4

(-3+3)×[(-1)

-2×|-3|+(-6) ×(-

3(-2x-5)+2x=9 2x-

化简求值:2x+(-x+3xy+2y)-2(0.5x-

2222222008-(1-0.5×1)] 3151)-|+|÷(-) 812212x?1=-1 36112xy+y),其中x=,y=3. 22

0.4x?0.90.03?0.02xx?5335 ?4? ??(-+-)?(-7)0.50.0327414

?3?1?3??1?312 ?1???2?????2? ?1?(0.28-14+4)143??4?2????2?

5

1135?3?0.71??3.5?(-32.5)-7.1?0.075 44

212???1?(?3)2?2?????4?22???? 4?3??3?

化简求值 8xy?3x

(-3)-2 ÷

(1-

23?2 ??5x?2?3xy?2x?,其中x=-1,y=12211222×3 -1-[2-(1-×0.5)]×[3-(-2)] 3313+)×(-48) 2x+3=x-1 64

22x?15x?1(3x+7)=2-1.5x -=1 736

6

80% ·x =(x+22)·75% ?4?4

13311?2?(?3) 434

?3?1?1????3?????1? ?5?3?9?

2362 ?4??3???0.8???(?2) ?3?(?2)??(?1)??(?3)??3?(?2) ?

?3?5???16??

x1?2?3x?7?14?4x ???4???4 32?3?

2x?32?3x ?1?32

先化简,再求值3x?(2x?x?1)?2(?3?x?x),其中x??3

222

7

[15.25-13-(-14.75)]×(-0.125)÷

-12?[135731 ()÷ ??4612223213?8×(-3)]×0-(-5)2 3?6÷(-2)?(-4)×2 4

x?2(x?1)?3x

3x?4?7x?8

3?x2?2

3(x?4)

-14-(-2)3×5+0.25÷(-12

2)

52?(y?x)?(5x?2y) x?(7?8x)?3(x?2) x?x?12?2?x?23 25?31?1?4???25??2?25????4?? 8

-4×2

511

??5?(-4)3×?22÷4 -12-[2-(1-×0.5)]×[32-(-2)2]

8

4

?32?(?2)3????(?1)6?1?(?3)?

???3?(?2)2

6

15+(―14)―15―(―0.25) 2923

24

×(-12) 25

(—5.3)+(—3.2)—(—2.5)—(+4.8)

9

3(-16+34-112)×(-48) (?81)?94?4

9

?(?32)

×34―(―25)×12+25×(-14)

(—314)+(+8132)—(—54

??48??6???25????4? (?2?3?5)?(?12)

-2

+|5-8|+24÷(-3)

?

7100?2004?

7

100

?1213???1?1?2??103????83???33??

(?1.25)?8?1.25?(?8) -2

3

4

6

???11???11????21??????33?????1??2?4?2??4???14??

?1.5?1.4???3.6??4.3???5.2? 113?6?1

4

)?(-24)

1?13

2-8????2??

(10

(-51

)+(+3.5)+(-) ??5.7????1.8??2.3 66

8?????1?

4?3?

???5??4

32

?(?4)3

?3?843?(?6)?(?13?18);

(10x3?6x2?5x?4)?(?9x3?2x2?4x?2)

15?(7?5x)?2x?(5?3x)

11

13?12?14?13

|?32?(?3)2

|?1012022

21?

3

8x?[3x?(7x?2)?4]

2x?15x6??1

8

?1

1?1x0.18?0.03x?

??y?y?8?1??1 ??3?3?

12?(?8)?(?11)?(?6)

??231?

??3?4?12??

???24?

?31?36?(?2)2?2?(?6)

x?(?215

3)?6

0.50.02???538????

?72???3?

3????????78???4.5?25?98

?14?

12

6

??2???3??

2x??1

12

1211(?3)2?[(?)?(?)]? 3.6÷4.5-3×| - | 93412

1??1?22??2?2???4?2????1??3???2??2???2????? ?2??2?

??3??3?52????2???1?0.8????22???2?? 4??????

(-3)×(-9)-8×(-5) -63÷7+45÷(-9)

-3×2-(-3×2) (-0.1)-

-2-3×(-2)-(-1) (-)?

13 33423313?(-)2 4532221?|-3|?(?0.25)?()6 32

[11×2-|3÷3|-(-3)-3]÷

23321 2?(-1)3-(-1.2)2?0.42 ) 492

0.25???2?

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

132522?1??3?12.???0.3????????3????1? ??2??22?????10? ?3?42232

32?1?.????2????8? ??2????05?2?

?32?4 2-7+4-3

4-(-2)-3÷(-1) (-5)×(-

14 33239)÷(-) 525

(-2)-(-1)×(23111311-)÷-?1 25×-(-25)×-25× 236

1÷[(-2)2×0.52-(-2.24)÷(-2)3]-17

8

(-16)+(+27)+(+9)+(一24) (

(一3)×18+14

(?114

5)?(?35)

42412+[-9×(+19)-0.8]}÷(-525) 一5)+(一2)+(+9)一(一8) ?9?40?25; (?2)?13?(?3) {415

111313?36?(??); ?1?2?(?)???3?; 9618432

?32?2?3?(?2)2 ?20?(?14)?(?18)?13

211111??1?(?2)?(?2.75) (-24)×(-+) 524642

-14-(-2)3×5+0.25÷(-

12 31?1?25????25???25????)422?4?

设A=2x+3x-x, B=4x+8x-2x+6,当x=

323211时,求A-B的值 22

(5a-3b)+[(a+b)-(5a+3b)],其中a=-1,b=1

16 222222

(—5)—5 (—3

(—5.3)+(—3.2)—(—2.5)—(+4.8) 15+(―1)―15―(―0.25) 4

21?(?) 9—(—3) 510113)+(+8)—(—5) 424

9423(?81)???(?32) 29×(-12) 4924

42425×3―(―25)×1+25×(-1) ??48??6???25????4?

17

12—(—18)+(—7)—15 (?

235

??)?(?12) 346

52?1?

??2x2?x?1??6?x2?x?2?,其中x??

33 ?2?

-2+|5-8|+24÷(-3) ??1??1???2????3????1?

?

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

?

77?2004? ?1.5?1.4???3.6??4.3???5.2? 100100

?12??10???8??3? ??9????19????29??……??99?

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

??1????2????3????4??……???99????100? (

18

111

??)?(-24) 364

(?1.25)?8?1.25?(?8)

3

-22-1

8???1?

?2?? (-

??5.7????1.8??2.3

1

3?1

2?1

4?1

3

2022

|?32?(?3)2|?10121?3

516)+(+3.5)+(-6) 8?????1?4?????5??34 32?(?4)3?3?843?(?6)?(?13?18); (10x3?6x2?5x?4)?(?9x3?2x2?4x?2)19

8x?[3x?(7x?2)?4] 15?(7?5x)?2x?(5?3x)

2x?1

6?5x?1

8?1

x0.18?

0.5?0.03x

0.02?1

1?3??y?13?y?8?????1 20

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