用简便方法计算.4.05÷[1.8×(3.36-2.86)] =

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用简便方法计算.4.05÷[1.8×(3.36-2.86)] =
用简便方法计算.4.05÷[1.8×(3.36-2.86)] =

用简便方法计算.4.05÷[1.8×(3.36-2.86)] =
4.05÷[1.8×(3.36-2.86)]
=4.05÷(1.8×.5)
=4.5×0.9÷1.8÷5
=4.5÷5×(0.9÷1.8)
=0.9×0.5
=0.45