һϲѧϰ

ѧϰ     2019-12-20 15:13:23

һ뿪СѧһµĻµѧܶѧرѧôСΪ׼˳һϲѧϰϣԴ!ӭĶο

һϲѧϰ

һѡ

1.˵ȷĸ()

һǷ һǸ һǸ һǸ

A 1 B 2 C 3 D 4

2.˵ȷ()

0ǾֵС ෴ڱǸ

ԭΪ෴ ȽֵķС

A ٢ B ٢ C ٢ڢ D ٢ڢۢ

3.ȷ()

A -5/7+2/7=-(5/7+2/7)=-1 B -7-2×5=-9×5=-45

C 3÷5/4×4/5=3/1=3 D -(-3)2=-9

4.a+b<0,ab<0,()

A a>0,b>0 B a<0,b<0

C a,bһһľֵڸľֵ

D a,bһһҸľֵľֵ

5.ij۵ƷƵ۴ϷֱΪ(25±0.1)kg,(25±0.2)kg,(25±0.3)kgóǵ()

A0.8kgB0.6kgC0.5kgD0.4kg

6.һ1mСһνȥڶνȥʣµ˽ȥ

κʣµСij()

A()5mB[1-()5]mC()5mD[1-()5]m

7.ab≠0,ȡֵ()

A0B1C2D-2



8.ȴСĺΪ()

9.ô2aһ()

10.0

11.׶뱱ʱΪ-12Сʱ(ʾͬһʱ̱ȱʱ

ʱ)ʱ1011400ô׶ʱ

12Ϻֶ·ȫ30kmʱԼΪ8min,ô

ƽٶÿѧʾԼΪ()m/min

13.涨a*b=5a+2b-1,(-4)*6ֵΪ().

14.֪=3=2ab<0,a-b=()

15.֪a=25,b=-3,a99+b100ĩλ()



16.-2-12×(1/3-1/4+1/2)

17.8-2×32-(-2×3)2

18.3/2×5/7-(-5/7)×5/2+(-1/2)÷7/5



23.֪1+2+3+…+31+32+33==17×331-3+2-6+3-9+4-12+…

+31-93+32-96+33-99ֵ

24.123…50ǰ”+””-”ǵĺý

СǸǶ?гʽ

25.ijСAسڶ·ϼ·涨

ʻΪʻΪһߴʻ¼(λkm)

һ-4

ڶ+7

-9

Ĵ+8

+6

-5

ߴ-2

(1)չʱAضԶ?

(2)ڵڴμ¼ʱAԶ

(3)ÿkm0.3ʹͶ?

һϲѧϰ_ѧĩܸϰ

һѡ⣺1-7BADDBCB

⣺

8.-3;9.;10.;11.200;12.3.625×106;13.-9;14.5

-5;15.6

16.-9;17.-45;18.;

⣺23.-2×17×33;24.0;25.(1)1(2)(3)12

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