2.4÷1.22.4 0.35÷0.99 0.35 1.99÷11.99
0.99×0.90.99
4.05÷0.54.05
a×0.5a÷2(a>0)
0.56÷0.80.56
0.98÷0.350.98
2.14÷12.14
4.56÷14.56
1.8÷1.21.8
22.5÷1.522.5
方法一:
方法二:
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