1原式=（1001×363）/（36×10101）乘（63×10101）/(636×1001) =363×63/36×636 =847/8482[(2/1+4/1+6/1+8/1)-(3/1+6/1+9/1+12/1)]÷[(4/1+8/1+12/1+16/1)-(5/1+10/1+15/1+20/1)] =1
