2分之1 = 0.54分之1 = 0.254分之3 = 0.755分之1 =0.25分之2 = 0.45分之3 =0.65分之4= 0.88分之1 =0.1258分之3 = 0.3758分之5 = 0.6258分之7 =0.87510分之1 =0.110分之3 =0.310分之7 =0.710分之9 =0.9 解答完毕！请采纳！
