2÷[(1/27-1/36)×9]×6
2个回答
2015-06-22
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2÷[(1/27-1/36)×9]×6
=2÷[(1/3×1/9-1/4×1/9)×9]×6
=2÷[(1/3-1/4)×1/9×9]×6
=2÷[1/12×1/9×9]×6
=2÷1/12×6
=2÷1/6
=12 分母不一样的要通分
=2÷[(1/3×1/9-1/4×1/9)×9]×6
=2÷[(1/3-1/4)×1/9×9]×6
=2÷[1/12×1/9×9]×6
=2÷1/12×6
=2÷1/6
=12 分母不一样的要通分
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