【1】(73+1/15）×1/8 =（72+1+1/15）x1/8=（72+16/15）x1/8=72x1/8+16/15x1/8=9+2/15=9又2/15【2】1/86+303/8686+90909/868686+13131313/8686868686+1717171717/868686868686 =1/86+101*3/86*101+9*10101/86*10101+...