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所属成套资源:中考数学总复习成套专题教学PPT课件(安徽专用)
中考数学总复习08第八章热点题型探究PPT课件(安徽专用)
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这是一份中考数学总复习08第八章热点题型探究PPT课件(安徽专用),文件包含§83几何探究型ppt、§86开放探究型ppt、§85阅读理解型ppt、§84二次函数综合应用型ppt、§81选择填空压轴题的题型探究ppt、§82观察归纳型ppt等6份课件配套教学资源,其中PPT共255页, 欢迎下载使用。
1.(2020新疆,8,5分)二次函数y=ax2+bx+c的图象如图所示,则一次函数y=ax+b和反比例函数y= 在同一平面直角坐标系中的图象可能是 ( )
答案 D 由抛物线开口向上可得a>0.∵抛物线的对称轴x=- 在y轴右侧,∴- >0,而a>0,∴b0.当a>0,b0时,反比例函数y= 的图象经过第一、三象限,故选D.
2.(2018安徽合肥瑶海一模,9)在同一直角坐标系中,函数y=mx+m和函数y=-mx2+2x+2(m是常数,且m≠0)的
图象可能是 ( )
答案 D 当m>0时,函数y=mx+m单调递增,且在y轴上的截距为正,函数y=-mx2+2x+2的图象开口向下,其
对称轴在y轴右侧.当m
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