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1、【探究】1.正方体的棱长为x，那么正方体的表面积y 与 x 之间有什么关系？2.n 个球队参加比赛，每两队之间进行一场比赛 比赛的场次数m 与球队数 n 有什么关系？【思考】这三个函数关系式有什么共同点？y=6x2m=21n2-21n y=20 x2+40 x+20 二次函数的定义：一般地，形如y=ax2bxc（a，b，c 是常数，a 0）的函数，叫做二次函数 其中，x 是自变量，a,b，c 分别是函数解析式的二次项系数、一次项系数和常数项【尝试练习】1.下列各式中表示二次函数的是（）2.由于某商品的销售较好,因此决定对该商品价格分两次提价，若设平均每次提价的百分比为x，该商品的原价为36 元
2、，提价后的价格为y元，则y与x之间的函数关系为()A.y=72(1+x)B.y=36(1+x)C.y=36(1+x2)D.y=36(1+x)23.若 y=(m+1)x|m|+1-x+3 是关于x的二次函数，则（）A.m=-1 B.m1 C.m=1 D.m=1 4.二次函数 y=4x2+5x-1 中，二次项系数是，一次项系数是.5.n 支球队参加比赛，每两队之间进行两场比赛，则比赛场次数 m 与球队数 n 之间的关系式是 _文档编码:CU8D1Q9M4I1 HJ2R3M3L1D5 ZZ2J1D7Y6V9文档编码:CU8D1Q9M4I1 HJ2R3M3L1D5 ZZ2J1D7Y6V9文档编码:CU
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