56×0.9956
15.6×2.3156×0.23
1.8×101.8÷0.1
6.8平方分米6平方分米8平方厘米
7.6÷0.87.6 4.9×1.034.9+1.8
0.98×0.850.85 2.38×102.38÷0.1