AMC8历年真题及答案解析2025.docVIP

AMC8历年真题及答案解析2025

一、单项选择题（每题2分）

1.If\(x+5=12\),then\(x\)equals:

A.7

B.6

C.5

D.8

E.9

答案：A

2.Whatisthevalueof\(3^2+3^3\)?

A.18

B.24

C.30

D.36

E.42

答案：B

3.Ifarectanglehasalengthof8inchesandawidthof4inches,whatisitsareainsquareinches?

A.12

B.16

C.20

D.24

E.32

答案：B

4.Thenumber0.25canbeexpressedasafraction:

A.\(\frac{1}{4}\)

B.\(\frac{1}{2}\)

C.\(\frac{3}{4}\)

D.\(\frac{2}{3}\)

E.\(\frac{3}{2}\)

答案：A

5.If\(5a=20\),then\(a\)equals:

A.3

B.4

C.5

D.6

E.7

答案：B

6.Thesumoftheanglesinatriangleis:

A.90degrees

B.180degrees

C.270degrees

D.360degrees

E.720degrees

答案：B

7.Whatisthevalueof\(\sqrt{16}\)?

A.4

B.8

C.16

D.-4

E.-8

答案：A

8.Ifatraintravelsat60milesperhour,howfarwillittravelin3hours?

A.180miles

B.200miles

C.220miles

D.240miles

E.260miles

答案：D

9.Theprimefactorizationof28is:

A.\(2^2\times7\)

B.\(2^3\times7\)

C.\(2\times3\times7\)

D.\(2^4\times7\)

E.\(2\times14\)

答案：A

10.If\(x=-3\),whatisthevalueof\(x^2\)?

A.-9

B.9

C.-6

D.6

E.0

答案：B

二、多项选择题（每题2分）

1.Whichofthefollowingnumbersareprime?

A.2

B.3

C.4

D.5

E.6

答案：A,B,D

2.Whatarethefactorsof12?

A.1

B.2

C.3

D.4

E.6

答案：A,B,C,D,E

3.Thefollowingshapesarequadrilaterals:

A.Square

B.Rectangle

C.Triangle

D.Trapezoid

E.Circle

答案：A,B,D

4.If\(a=3\)and\(b=4\),whatisthevalueof\(a+b\)?

A.7

B.8

C.9

D.10

E.11

答案：A,B

5.Thefollowingexpressionsareequivalentto\(2^3\):

A.8

B.9

C.10

D.11

E.12

答案：A

6.Thefollowinganglesareacute:

A.30degrees

B.45degrees

C.60degrees

D.90degrees

E.120degrees

答案：A,B,C

7.Thefollowingnumbersareintegers:

A.-5

B.0

C.3.5

D.7

E.10.2

答案：A,B,D

8.Thefollowingshapesarepolygons:

A.Triangle

B.Square

C.Circle

D.Pentagon

E.Hexagon

答案：A,B,D,E

9.Thefollowingexpressionsareequalto\(\frac{1}{2}\):

A.\(\frac{2}