2.7*1.3=()*0.13=0.27*()=0.027*()=()*0.013

2.7*1.3=()*0.13=0.27*()=0.027*()=()*0.013

2.7*1.3=(27)*0.13=0.27*(13)=0.027*(130)=(270)*0.013
希望對您有所幫助