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
0.58×1.040.58 2.4÷1.62.4×1.6
3.05×15.730.5×1.57 0.34÷0.770.34