0.55÷0.90.55 0.55×0.90.55
7.3÷0.0173×100 7.3÷0.373÷3
1.3×2.8= 0.13×0.28= 13×2.8=
2.56×1.022.56 12.3÷0.9912.3
4.67×0.954.67÷0.95 40.5×140.5÷1