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十进制数（34.5）10=( )2=( )16

编写程序，完成下列题目:从键盘上输入两个数x,y，求x,y之和并将其赋值给s，最...入样例：34.5输出样例：s=7.5

下列选项为某变速器一、二、三、四挡的传动比，则三挡的传动比为（）。 A: 0.969 B: 1.286 C: 1.944 D: 3.455