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2数学公式÷[(数学公式-数学公式)×1.2+0.8]

解:2÷[(-)×1.2+0.8],
=÷[()×1.2+0.8],
=÷[×1.2+0.8],
=÷0.9,
=×
=2
分析:本题按照先计算中括号内部的,再计算中括号外面的,使计算又正确又简便.
点评:本题主要考查了分数的四则混合运算的顺序及运算法则的运用.
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