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歡迎您訪問數(shù)學(xué)考題練習(xí):利用函數(shù)圖象解不等式:4x-5>-2x+7.!

數(shù)學(xué)考題練習(xí):利用函數(shù)圖象解不等式:4x-5>-2x+7.

更新時間:2024-01-12 16:28:54作者:貝語網(wǎng)校

利用函數(shù)圖象解不等式:4x-5>-2x+7.

試題答案

解:令y1=4x-5,y2=-2x+7,

∵當y1=y2,即4x-5=-2x+7時,x=2,y=3,

∴兩函數(shù)的交點坐標為(2,3),

∴不等式4x-5>-2x+7的解集為:x<2.

試題解析

分別令y1=4x-5,y2=-2x+7,利用描點法在同一坐標系內(nèi)畫出兩函數(shù)的圖象,根據(jù)函數(shù)的圖象即可解答.

點評:本題考查了一次函數(shù)與一元一次不等式的知識,解答此題的關(guān)鍵是確定出兩函數(shù)圖象的交點坐標及另一點的坐標,用描點法畫出函數(shù)的圖象.

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