34.5÷0.25÷0.4
解:原式=34.5÷（1÷4）÷0.4
=34.5÷1×4÷0.4
=（34.5÷1）×（4÷0.4）
=34.5×10
=345
解：
34.5÷0.25÷0.4
=34.5÷(0.25×0.4)
=34.5÷0.1
=345
34.5除以0.25除以0.4
=34.5除以(0.25x0.4)
=34.5除以0.01
=3450
34.5÷0.25÷0.4
= 34.5÷（0.25×0.4）
=34.5÷0.1
=345
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