10个数字中抽取3个,再抽取1,2...6个的概率各是多少?答:P(总2)=0.588 D抓3个:第一种情况P=0.01×C(9,2)C(1,1)/C(10,3)=0.003 P2=0.027×[C(2,1)C(8,2)+C(2,2)C(8,1)]/C(10,3)=0.0144 P3=0.072×[C(3,1)C(7,2)+C(3,2)C(7,1)+C(3,3)]/C(10,3)=0.051 P(总3)= 0.0684 D抓(4)(5)(...
c语言printf问题答:printf("a=%f\n", b);printf("b(%%f)=%f, b(%%lf)=%lf, b(%%5.4lf)=%5.4lf, b(%%e)=%e\n\n",b,b,b,b);printf("c=%f\n", c);printf("c(%%lf)=%lf, c(%%f)=%f, c(%%8.4lf)=%8.4lf\n\n",c,c,c);printf("d=%c\n", d);printf("d(%%c)=%c,...