(0.78+8.7)÷(8.7-0.78)=9.48÷7.92=1.196969696…(其中循环小数部位为96)
(0.78+8.7)÷(0.78-8.7) =9.48÷(-7.92) =-474/391
(0.78+8.7)/(8.7-0.78)=9.48/7.92=1.1969697