[0.01-0.01X0.01]除以0.1（先做中括号里）=[0.01(1-0.01）]÷0.1=[0.01×0.09]×1/0.1=0.0009×1/0.1（分子分母同时×10）=0.009
原式=0.01（1-0.01）/0.1 =0.01*0.09/0.1 =0.1*0.09 =0.009
