2025年中考数学二次函数最值题库

2025年中考数学二次函数最值题库1.抛物线y=x^2-4x+3的顶点坐标是？A.(2,-1)B.(2,1)C.(-2,-1)D.(-2,1)2.函数y=-2x^2+4x+1的最大值是？A.1B.2C.3D.43.抛物线y=1/2x^2-3x+5的对称轴是？A.x=3B.x=-3C.x=6D.x=-64.函数y=-x^2+6x的最小值是？A.0B.3C.6D.95.抛物线y=3x^2-6x+2的顶点在？A.第一象限B.第二象限C.第三象限D.第四象限6.函数y=1/4x^2+2x+1的最小值是？A.-1B.0C.1D.27.抛物线y=-4x^2+8x-3的对称轴是？A.x=1B.x=-1C.x=2D.x=-28.函数y=2x^2-4x+7的最小值是？A.3B.4C.5D.69.抛物线y=1/3x^2-x+1的顶点坐标是？A.(3/2,5/12)B.(-3/2,5/12)C.(3/2,11/12)D.(-3/2,11/12)10.函数y=-3x^2+6x+5的最大值是？A.5B.6C.7D.811.抛物线y=2x^2+4x+1的对称轴是？A.x=-1B.x=1C.x=-2D.x=212.函数y=-1/2x^2+2x的最小值是？A.0B.1C.2D.313.抛物线y=5x^2-10x+1的顶点坐标是？A.(1,-4)B.(-1,-4)C.(2,-3)D.(-2,-3)14.函数y=x^2-2x+8的最小值是？A.2B.4C.6D.815.抛物线y=-1/2x^2+2x-1的对称轴是？A.x=1B.x=-1C.x=2D.x=-216.函数y=2x^2-4x+3的最小值是？A.1B.2C.3D.417.抛物线y=3x^2-6x+4的顶点坐标是？A.(1,1)B.(-1,1)C.(2,0)D.(-2,0)18.函数y=-2x^2+4x+5的最大值是？A.5B.6C.7D.819.抛物线y=1/4x^2+x+1的对称轴是？A.x=-1/2B.x=1/2C.x=-2D.x=220.函数y=-3x^2+6x-2的最大值是？A.-2B.0C.2D.421.抛物线y=4x^2-8x+3的顶点坐标是？A.(1,-1)B.(-1,-1)C.(2,-1)D.(-2,-1)22.函数y=1/3x^2-2x+5的最小值是？A.3B.4C.5D.623.抛物线y=-2x^2+4x+1的对称轴是？A.x=1B.x=-1C.x=2D.x=-224.函数y=3x^2-6x+7的最小值是？A.1B.2C.3D.425.抛物线y=1/2x^2-2x+3的顶点坐标是？A.(2,-1)B.(-2,-1)C.(1,1)D.(-1,1)26.函数y=-x^2+4x-1的最大值是？A.1B.2C.3D.427.抛物线y=2x^2+4x+5的对称轴是？A.x=-1B.x=1C.x=-2D.x=228.函数y=1/2x^2-3x+4的最小值是？A.1/2B.1C.2D.329.抛物线y=-3x^2+6x-1的顶点坐标是？A.(1,2)B.(-1,2)C.(2,1)D.(-2,1)30.函数y=2x^2-4x+5的最大值是？A.1B.2C.3D.431.抛物线y=5x^2-10x+5的对称轴是？A.x=1B.x=-1C.x=2D.x=-232.函数y=-1/2x^2+2x-1的最小值是？A.-1B.0C.1D.233.抛物线y=3x^2-6x+2的顶点坐标是？A.(1,-1)B.(-1,-1)C.(2,0)D.(-2,0)34.函数y=4x^2-8x+4的最小值是？A.0B.1C.2D.335.抛物线y=1/4x^2+x-1的对称轴是？A.x=-1/2B.x=1/2C.x=-2D.x=236.函数y=-2x^2+4x+3的最大值是？A.3B.4C.5D.637.抛物线y=2x^2-4x+1的顶点坐标是？A.(1,-1)B.(-1,-1)C.(2,0)D.(-2,0)38.函数y=3x^2-6x+5的最小值是？A.1B.2C.3D.439.抛物线y=1/2x^2-2x+1的对称轴是？A.x=1B.x=-1C.x=2D.x=-240.函数y=-3x^2+6x-2的最大值是？A.-2B.0C.2D.441.抛物线y=4x^2-8x+1的顶点坐标是？A.(1,-3)B.(-1,-3)C.(2,-3)D.(-2,-3)42.函数y=1/3x^2-2x+6的最小值是？A.2B.3C.4D.543.抛物线y=-2x^2+4x+2的对称轴是？A.x=1B.x=-1C.x=2D.x=-244.函数y=3x^2-6x+7的最小值是？A.1B.2C.3D.445.抛物线y=1/2x^2-2x+2的顶点坐标是？A.(2,-1)B.(-2,-1)C.(1,1)D.(-1,1)46.函数y=-x^2+4x-2的最大值是？A.2B.3C.4D.547.抛物线y=2x^2+4x+3的对称轴是？A.x=-1B.x=1C.x=-2D.x=248.函数y=1/2x^2-3x+5的最小值是？A.1/2B.1C.2D.349.抛物线y=-3x^2+6x-3的顶点坐标是？A.(1,0)B.(-1,0)C.(2,-1)D.(-2,-1)50.函数y=2x^2-4x+4的最大值是？A.0B.1C.2D.351.抛物线y=5x^2-10x+4的对称轴是？A.x=1B.x=-1C.x=2D.x=-252.函数y=-1/2x^2+2x-2的最小值是？A.-1B.0C.1D.253.抛物线y=3x^2-6x+3的顶点坐标是？A.(1,0)B.(-1,0)C.(2,-1)D.(-2,-1)54.函数y=4x^2-8x+3的最小值是？A.0B.1C.2D.355.抛物线y=1/4x^2+x-2的对称轴是？A.x=-1/2B.x=1/2C.x=-2D.x=256.函数y=-2x^2+4x+4的最大值是？A.4B.5C.6D.757.抛物线y=2x^2-4x+2的顶点坐标是？A.(1,-1)B.(-1,-1)C.(2,0)D.(-2,0)58.函数y=3x^2-6x+6的最小值是？A.0B.1C.2D.359.抛物线y=1/2x^2-2x+3的对称轴是？A.x=1B.x=-1C.x=2D.x=-260.函数y=-3x^2+6x-5的最大值是？A.-5B.0C.5D.1061.抛物线y=4x^2-8x+2的顶点坐标是？A.(1,-2)B.(-1,-2)C.(2,-2)D.(-2,-2)62.函数y=1/3x^2-2x+7的最小值是？A.1B.2C.3D.463.抛物线y=-2x^2+4x+3的对称轴是？A.x=1B.x=-1C.x=2D.x=-264.函数y=3x^2-6x+8的最小值是？A.0B.1C.2D.365.抛物线y=1/2x^2-2x+4的顶点坐标是？A.(2,0)B.(-2,0)C.(1,1)D.(-1,1)66.函数y=-x^2+4x-3的最大值是？A.3B.4C.5D.667.抛物线y=2x^2+4x+4的对称轴是？A.x=-1B.x=1C.x=-2D.x=268.函数y=1/2x^2-3x+6的最小值是？A.1/2B.1C.2D.369.抛物线y=-3x^2+6x-4的顶点坐标是？A.(1,2)B.(-1,2)C.(2,1)D.(-2,1)70.函数y=2x^2-4x+5的最大值是？A.5B.6C.7D.871.抛物线y=5x^2-10x+5的对称轴是？A.x=1B.x=-1C.x=2D.x=-272.函数y=-1/2x^2+2x-3的最小值是？A.-3B.-2C.-1D.073.抛物线y=3x^2-6x+4的顶点坐标是？A.(1,-1)B.(-1,-1)C.(2,0)D.(-2,0)74.函数y=4x^2-8x+4的最小值是？A.0B.1C.2D.375.抛物线y=1/4x^2+x-1的对称轴是？A.x=-1/2B.x=1/2C.x=-2D.x=276.函数y=-2x^2+4x+3的最大值是？A.3B.4C.5D.677.抛物线y=2x^2-4x+1的顶点坐标是？A.(1,-1)B.(-1,-1)C.(2,0)D.(-2,0)78.函数y=3x^2-6x+5的最小值是？A.1B.2C.3D.479.抛物线y=1/2x^2-2x+1的对称轴是？A.x=1B.x=-1C.x=2D.x=-280.函数y=-3x^2+6x-2的最大值是？A.-2B.0C.2D.481.抛物线y=4x^2-8x+1的顶点坐标是？A.(1,-3)B.(-1,-3)C.(2,-3)D.(-2,-3)82.函数y=1/3x^2-2x+6的最小值是？A.2B.3C.4D.583.抛物线y=-2x^2+4x+2的对称轴是？A.x=1B.x=-1C.x=2D.x=-284.函数y=3x^2-6x+7的最小值是？A.1B.2C.3D.485.抛物线y=1/2x^2-2x+2的顶点坐标是？A.(2,-1)B.(-2,-1)C.(1,1)D.(-1,1)86.函数y=-x^2+4x-2的最大值是？A.2B.3C.4D.587.抛物线y=2x^2+4x+3的对称轴是？A.x=-1B.x=1C.x=-2D.x=288.函数y=1/2x^2-3x+5的最小值是？A.1/2B.1C.2D.389.抛物线y=-3x^2+6x-3的顶点坐标是？A.(1,0)B.(-1,0)C.(2,-1)D.(-2,-1)90.函数y=2x^2-4x+4的最大值是？A.0B.1C.2D.391.抛物线y=5x^2-10x+4的对称轴是？A.x=1B.x=-1C.x=2D.x=-292.函数y=-1/2x^2+2x-2的最小值是？A.-1B.0C.1D.293.抛物线y=3x^2-6x+3的顶点坐标是？A.(1,0)B.(-1,0)C.(2,-1)D.(-2,-1)94.函数y=4x^2-8x+3的最小值是？A.0B.1C.2D.395.抛物线y=1/4x^2+x-2的对称轴是？A.x=-1/2B.x=1/2C.x=-2D.x=296.函数y=-2x^2+4x+4的最大值是？A.4B.5C.6D.797.抛物线y=2x^2-4x+2的顶点坐标是？A.(1,-1)B.(-1,-1)C.(2,0)D.(-2,0)98.函数y=3x^2-6x+6的最小值是？A.0B.1C.2D.399.抛物线y=1/2x^2-2x+3的对称轴是？A.x=1B.x=-1C.x=2D.x=-2100.函数y=-3x^2+6x-5的最大值