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2-2/3÷4/5-1/6
=2-2/3×5/4-1/6
=2-5/6-1/6
=2-(5/6+1/6)
=2-1
=1
5/9×[3/4-(7/16-1/4)]
=5/9×[3/4-7/16+1/4]
=5/9×[(3/4+1/4)-7/16]
=5/9×[1-7/16]
=5/9×9/16
=5/16
=2-2/3×5/4-1/6
=2-5/6-1/6
=2-(5/6+1/6)
=2-1
=1
5/9×[3/4-(7/16-1/4)]
=5/9×[3/4-7/16+1/4]
=5/9×[(3/4+1/4)-7/16]
=5/9×[1-7/16]
=5/9×9/16
=5/16
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