3/4÷[（2/3-1/6）×9]

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3/4÷[（2/3-1/6）×9]

3/4÷[（2/3-1/6）×9]
3/4÷[（2/3-1/6）×9]

3/4÷[（2/3-1/6）×9]
3/4÷[（2/3-1/6）×9]
=3/4÷[（1/2×9]
=3/4×2/9
=1/6