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歡迎您訪問數(shù)學(xué)考題練習(xí):使代數(shù)式的3x+5值不小于4x-1.5的值的x!

數(shù)學(xué)考題練習(xí):使代數(shù)式的3x+5值不小于4x-1.5的值的x

更新時(shí)間:2024-01-12 16:31:28作者:貝語網(wǎng)校

使代數(shù)式的3x+5值不小于4x-1.5的值的x的最大整數(shù)值是

A.4

B.6

C.7

D.不存在

試題答案

B

試題解析

先根據(jù)題意列出不等式3x+5≥4x-1.5,解不等式取其整數(shù)解中x的最大整數(shù)值是6.

解答:根據(jù)題意得3x+5≥4x-1.5

解得x≤6.5

所以x的最大整數(shù)值是6.

故選B.

點(diǎn)評:本題考查不等式的解法及整數(shù)解的確定.解不等式要用到不等式的性質(zhì):(1)不等式的兩邊加(或減)同一個(gè)數(shù)(或式子),不等號的方向不變;(2)不等式兩邊乘(或除以)同一個(gè)正數(shù),不等號的方向不變;(3)不等式的兩邊乘(或除以)同一個(gè)負(fù)數(shù),不等號的方向改變.

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