10.8 ÷45
=0.24
9.36 ÷5.2
=93.6 ÷52
=1.8
72.9 ÷0.9
=729 ÷9
=81
竖式见图：
验算：
0.24 × 45 = 10.8
1.8 × 5.2 = 9.36
81 × 0.9 = 72.9
竖式见图：
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10.8 ÷45
=0.24
9.36 ÷5.2
=93.6 ÷52
=1.8
72.9 ÷0.9
=729 ÷9
=81
竖式见图：
验算：
0.24 × 45 = 10.8
1.8 × 5.2 = 9.36
81 × 0.9 = 72.9
竖式见图：