5/7x15-3/13x5/7-5/7x10/13简便计算 5/7x15-3/13x5/7-5/7x10/13简便计算 =5/7x(15-3/13-10/13) =5/7x14 =10
5/7x15-13/3×5/7-5/7×10/13简便计较 5/7x15-3/13×5/7-5/7×10/13简便计算 =5/7x(15-3/13-10/13) =5/7x14 =10