规律如下: 　　y=0*(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)/(1-2)(1-3)(1-4)(1-5)(1-6)(1-7)(1-8)(1-9) 　　+2*(x-1)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)/(2-1)(2-3)(2-4)(2-5)(2-6)(2-7)(2-8)(2-9) 　　+7*(x-1)(x-2)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)/(3-1)(3-2)(3-4)(3-5)(3-6)(3-7)(3-8)(3-9) 　　+21*(x-1)(x-2)(x-3)(x-5)(x-6)(x-7)(x-8)(x-9)/(4-1)(4-2)(4-3)(4-5)(4-6)(4-7)(4-8)(4-9) 　　+42*(x-1)(x-2)(x-3)(x-4)(x-6)(x-7)(x-8)(x-9)/(5-1)(5-2)(5-3)(5-4)(5-6)(5-7)(5-8)(5-9) 　　+73*(x-1)(x-2)(x-3)(x-4)(x-5)(x-7)(x-8)(x-9)/(6-1)(6-2)(6-3)(6-4)(6-5)(6-7)(6-8)(6-9) 　　+113*(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-8)(x-9)/(7-1)(7-2)(7-3)(7-4)(7-5)(7-6)(7-8)(7-9) 　　+163*(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-9)/(8-1)(8-2)(8-3)(8-4)(8-5)(8-6)(8-7)(8-9) 　　+221*(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)/(9-1)(9-2)(9-3)(9-4)(9-5)(9-6)(9-7)(9-8)