分解因式:a3-10a2+25a= .
考点分析:
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函数
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中,自变量x的取值范围是
.
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如图是一个由正方形ABCD和半圆O组成的封闭图形,点O是圆心.点P从点A出发,沿线段AB,弧BC和线段CD匀速运动,到达终点D.运动过程中OP扫过的面积(s)随时间(t)变化的图象大致是( )
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A.
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B.
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C.
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D.
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如图,已知△ABC中,∠CAB=∠B=30°,AB=2
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,点D在BC边上,把△ABC沿AD翻折使AB与AC重合,得△AB′D,则△ABC与△AB′D重叠部分的面积为( )
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A.
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B.
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C.3-
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D.
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果农按照正方形的规律种植苹果树.为了保护果树免受强台风侵袭,他在苹果树的周围栽种了针叶树.如图是栽种情况的示意图,我们可以看到苹果树和针叶树的种植规律.按照这样的规律,若苹果树的棵数与针叶树的棵数相等,那么n=( )
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A.6
B.7
C.8
D.9
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一个扇形的圆心角为60°,弧长为2π厘米,则这个扇形的半径为( )
A.6厘米
B.12厘米
C.
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厘米
D.
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厘米
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