试题与答案

已知△ABC与△A'B'C'相似,相似比为2:3;△A'B'C'与△A''B''

题型:选择题

题目:

已知△ABC与△A'B'C'相似,相似比为2:3;△A'B'C'与△A''B''C''相似,相似比为5:4,那么△ABC与△A''B''C''的相似比为(  )

A.5:6

B.6:5

C.15:8

D.8:15

答案:

∵△ABC与△A′B′C′相似,△A′B′C′与△A″B″C″相似,

∴△ABC与△A″B″C″相似,

∵△ABC与△A′B′C′的相似比为2:3=10:15;△A′B′C′与△A″B″C″的相似比为5:4=15:12,

∴△ABC与△A″B″C″相似比为10:12=5:6.

故选A.

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题型:改错题

短文改错

     When I was in high school, most of my friend had bicycles.I hoped I could also have it.One

day I saw a secondhand bicycle, that was only one hundred yuan.I asked my father the money.

So he said he could only give me half of the money.He should find the other half myself.So I

went to sell newspapers after the school.My father was pleasing when I showed him the money

a month after.He gives me the other fifty.You can imagine what happy I was when I rode to school

on my own bicycle.

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