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问题 解答题

已知：△ABC∽△A1B1C1，相似比为3：4，AB：BC：CA=2：3：4，△A1B1C1的周长是72cm，求△ABC的各边的长．

答案

∵△ABC中，AB：BC：CA=2：3：4，

∴可设AB=2k，BC=3k，AC=4k，

∵△ABC与△A1B1C1的相似比为3：4，

∴A1B1=

4
3
AB=
4
3
×2k=
8
3
k，

B1C1=

4
3
BC=
4
3
×3k=
12
3
k，

A1C1=

4
3
AC=
4
3
×4k=
16
3
k，

又∵△A1B1C1的周长是72cm，

∴

8
3
k+
12
3
k+
16
3
k=72，

解得，k=6．

∴AB=2×6=12cm，BC=3×6=18cm，AC=4×6=24cm．

选择题

下列说法中对我国政府的理解正确的有 [ ]

①国家权力机关的执行机关 ②人民意旨的执行者 ③人民利益的捍卫者 ④全体公民意志和利益的执行者和捍卫者

A．①②③

B．①②④　

C．①③④

D．②③④

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单项选择题

Virtualization is an approach to IT that pools and shares（）so that utilization is optimized and supplies automatically meet demand. Traditional IT environments are often silos, where both technology and human（）are aligned around an application or business function. With a virtualized（）, people, processes, and technology are focused on meeting service levels，（）is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization（）that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

With a virtualized（）

A．system

B．infrastructure

C．hardware

D．link
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