Question

31－3分之4－15分之4－35分之4－63分之4－99分之4－143分之4等于多少

Answer 1

31-4/3-4/15-4/35-4/64-4/99-4/143=31-4(1/3+1/15+1/35+1/63+1/99+1/143)=31-4(1/2)*[(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+(1/11-1/13)]=31-4*(1/2)(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13)=31-2*(1-1/13)=31-24/13