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歡迎您訪問數(shù)學(xué)考題練習(xí):一個點(diǎn)從數(shù)軸的原點(diǎn)開始,先向左移動3個單位,再!

數(shù)學(xué)考題練習(xí):一個點(diǎn)從數(shù)軸的原點(diǎn)開始,先向左移動3個單位,再

更新時間:2024-01-12 16:36:21作者:貝語網(wǎng)校

一個點(diǎn)從數(shù)軸的原點(diǎn)開始,先向左移動3個單位,再向右移動2個單位,這時該點(diǎn)所表示的數(shù)是

A.1

B.2

C.-1

D.-5

試題答案

C

試題解析

根據(jù)數(shù)軸表示數(shù)的方法,一個點(diǎn)從數(shù)軸的原點(diǎn)開始,先向左移動3個單位,再向右移動2個單位,這時該點(diǎn)所表示的數(shù)為0-3+2,然后計(jì)算即可.

解答:∵0-3+2=-1,

∴該點(diǎn)所表示的數(shù)為-1.

故選C.

點(diǎn)評:本題考查了數(shù)軸:數(shù)軸三要素(原點(diǎn)、單位長度、正方向);原點(diǎn)左邊的點(diǎn)表示負(fù)數(shù),原點(diǎn)右邊的點(diǎn)表示的數(shù)為正數(shù);左邊的點(diǎn)表示的數(shù)比右邊的點(diǎn)表示的數(shù)小.

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