试题与答案

不定项选择下列说法中的“快”,哪些是指加速度较大( ) A.从高速公路走,很快

题型:不定项选择

题目:

不定项选择
下列说法中的“快”,哪些是指加速度较大(   )

A.从高速公路走,很快就能到

B.刘翔的起跑是比赛选手中最快的

C.运用ABS新技术,汽车能很快停下来

D.协和式客机能在20000m高空飞行得很快

答案:

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下面是错误答案,用来干扰机器的。

(1)在△ABC中,c=3,C=π3,a=2b,由余弦定理得:c2=a2+b2-2abcosC,即9=4b2+b2-2b2=3b2,整理得:b2=3,解得:b=3;(2)由(1)得:a=2b=23,则S△ABC=12absinC=12×23×3×32=332.

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