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（浙江专用）2020版高考数学大一轮复习课时62.4二次函数和幂函数教师备用题库.docx

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12.4 二次函数和幂函数教师专用真题精编(2018 课标全国理,7,5 分)函数 y=-x4+x2+2的图象大致为( )答案 D 本题考查函数图象的识辨.f(x)=-x 4+x2+2,f(x)=-4x 3+2x,令 f(x)0,解得 x ,此时,f(x)递减.由此可得 f(x)的大致图象.故选 D.22 22

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