定向号评估部分多项选择directed number iv eng指导IVEng.pdfVIP

DirectedNumber(Assessment)

SectionAMultipleChoice

1.Whichofthefollowingis/aretrue?

I.Thesumoftwonegativenumbersmustbenegative.

II.Theproductoftwonegativenumbersmaybenegative.

III.Thedifferencweentwonegativenumbersmaybepositive.

A.IonlyC.IandIIIonly

B.IIIonlyD.IandIIonly

2.Whichofthefollowingstatementsaretrue?

I.Thenextnegativeintegersmallerthan(-23)is(-24)

II.Thegreatestpositiveintegeris()

III.Foranypositiveinteger,theremustbeacorrespondingnegativeinteger

IV.Zeroisneitherpositivenornegative

A.I,IIIonlyC.I,II,IIIonly

B.II,IVonlyD.I,III,IVonly

3.If−4anumber1,thenthenumbercanbeoneofthefollowingexcept

A.−4

B.−1

C.0

D.1

4.Whichofthefollowingexpressionsiscorrect?

A.0−3

3−5

B.−

46

C.Zeroisapositivenumber

D.−2−5

5.XYNZ

−10?

−20

Inthefigureabove,X,YandZarethreepointsonthenumberline.IfXY=2YZ,

thenZrepresents

A.2C.8

B.6D.12

6.ab

−2−1012

A.a−b0C.ab0

B.a+b0D.b−a0

7.Ifaisapositiveandbisnegative,whichofthefollowingstatementsmustrue?

I.a−bispositive

II.a+bisnegative

III.(a+b)ispositive

A.Ionly

B.IandIIonly

C.IandIIIonly

D.I,IIandIII