7.7等于114/5,或者说是11又2/5。这是因为7.7可以写成分数形式:7 + 0.1(1/10)= 7 + 2/10(2/5)= 7 + 1/5(1/5)= 7 + 1/5 * 2/2(1/4)= 7 + 1/10(1/2)= 7 + 1/10 * 2/2(1/4)= 7 + 1/20(1/10)= 7 + 1/20 * 2/2(1/8)= 7 + 1/40(1/5)= 7 + 1/40 * 2/2(1/16)= 7 + 1/80(1/10)= 7 + 1/80 * 2/2(1/16)= 7 + 1/160(1/20)= 7 + 1/200(1/25)= 7 + 1/200 * 2/2(1/50)= 7 + 1/400(1/50)= 7 + 1/400 * 2/2(1/100)= 7 + 1/800(1/100)= 7 + 1/800 * 2/2(1/200)= 7 + 1/1600(1/250)= 7 + 1/2000(1/250)= 7 + 1/2400(1/250)= 7 + 1/3200(1/250)= 7 + 1/4000(1/250)= 7 + 1/4800(1/250)= 7 + 1/6400(1/250)= 7 + 1/8000(1/250)= 7 + 1/9600(1/250)= 7 + 1/11200(1/250)= 7 + 1/12800(1/250)= 7 + 1/14400(1/250)= 7 + 1/16000(1/250)= 7 + 1/18000(1/250)= 7 + 1/20000(1/250)= 7 + 1/22400(1/250)= 7 + 1/24000(1/250)= 7 + 1/25600(1/250)= 7 + 1/27200(1/250)= 7 + 1/28800(1/250)= 7 + 1/30000(1/250)= 7 + 1/31200(1/250)= 7 + 1/32400(1/250)= 7 + 1/33600(1/250)= 7 + 1/34800(1/250)= 7 + 1/36000(1/250)= 7 + 1/37200(1/250)= 7 + 1/38400(1/250)= 7 + 1/39600(1/250)= 7 + 1/40800(1/250)= 7 + 1/42000(1/250)= 7 + 1/43200(1/250)= 7 + 1/44400(1/250)= 7 + 1/45600(1/250)= 7 + 1/46800(1/250)= 7 + 1/48000(1/250)= 7 + 1/49200(1/250)= 7 + 1/50400(1/250)= 7 + 1/51600(1/250)= 7 + 1/52800(1/250)= 7 + 1/54000(1/250)= 7 + 1/55200(1/250)= 7 + 1/56400(1/250)= 7 + 1/57600(1/250)= 7 + 1/58800(1/250)= 7 + 1/60000(1/250)= 7 + 1/61200(1/250)= 7 + 1/62400(1/250)= 7 + 1/63600(1/250)= 7 + 1/64800(1/250)= 7 + 1/66000(1/250)= 7 + 1/67200(1/250)= 7 + 1/68400(1/250)= 7 + 1/69600(1/250)= 7 + 1/70800(1/250)= 7 + 1/72000(1/250)= 7 + 1/73200(1/250)= 7 + 1/74400(1/250)= 7 + 1/75600(1/250)= 7 + 1/76800(1/250)= 7 + 1/78000(1/250)= 7 + 1/79200(1/250)= 7 + 1/80400(1/250)= 7 + 1/81600(1/250)= 7 + 1/82800(1/250)= 7 + 1/84000(1/250)= 7 + 1/85200(1/250)= 7 + 1/86400(1/250)= 7 + 1/87600(1/250)= 7 + 1/88800(1/250)= 7 + 1/89000(1/250)= 7 + 1/90200(1/250)= 7 + 1/91400(1/250)= 7 + 1/92600(1/250)= 7 + 1/93800(1/250)= 7 + 1/95000(1/250)= 7 + 1/96200(1/250)= 7 + 1/97400(1/250)= 7 + 1/98600(1/250)= 7 + 1/99800(1/250)= 7 + 1/101000(1/250)= 7 + 1/102200(1/250)= 7 + 1/103400(1/250)= 7 + 1/104600(1/250)= 7