1.83×8.7+18.3×0.13=1.83×8.7+1.83×1.3[此处之前可增加一步=1.83×8.7+1.83×10×0.13]=1.83×(8.7+1.3)=1.83×10=18.3
简便运算1.83*8.7+18.3*0.13=18.3*8.7+18.3*1.3=18.3*(8.7+1.3)=18.3*10=183
1.83X8.7+18.3X0.13=183X0.087+183X0.013=183X0.1=18.3