1、includeltstdioh void main float a，b，s，sumsum=0fora=1alt=20a++ fors=1，b=1blt=ab++s=s*bsum=sum+s printfquot%e\nquot，sum 先求出第n项阶乘，然后把前n1项阶乘的和加。2、求阶乘的函...