8.1/45简便计算
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8.1/45简便计算
8.1÷45
=(8.1×2)÷(45×2)——分子、分母分别乘以2
=16.2÷90
=0.18
8.1÷45
=8.1÷(9×5)
=8.1÷9÷5
=0.9÷5
=0.18
8.1/45简便计算
8.1÷45
=(8.1×2)÷(45×2)——分子、分母分别乘以2
=16.2÷90
=0.18
8.1÷45
=8.1÷(9×5)
=8.1÷9÷5
=0.9÷5
=0.18