10*0.017(17循环)=0.17(17循环)
1000*0.017(17循环)=17.17(17循环)
1000*0.017(17循环)-10*0.017(17循环)=17
990*0.017(17循环)=17
0.017(17循环)=17/990
10*0.017(17循环)=0.17(17循环)
1000*0.017(17循环)=17.17(17循环)
1000*0.017(17循环)-10*0.017(17循环)=17
990*0.017(17循环)=17
0.017(17循环)=17/990