设y = ax² + bx + c (a ≠ 0)
把(0,1)(2,4)(3,10)分别代入得:
c = 1
4a + 2b + c = 4
9a + 3b + c = 10
解得:
a = 3/2
b = -3/2
c = 1
所以函数解析式是 y = 3x²/2 - 3x/2 + 1
设y = ax² + bx + c (a ≠ 0)
把(0,1)(2,4)(3,10)分别代入得:
c = 1
4a + 2b + c = 4
9a + 3b + c = 10
解得:
a = 3/2
b = -3/2
c = 1
所以函数解析式是 y = 3x²/2 - 3x/2 + 1