1/6÷[9/17×(3/4+2/3)] (2/3+2/9)×（5/8-7/16） 6/7×5/8+3/8÷7/6 怎样算简便就怎样算
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1/6÷[9/17×(3/4+2/3)]
=1/6÷[9/17×(9/12+8/12)]
=1/6÷(9/17×17/12)
=1/6÷3/4
=1/6×4/3
=2/9
(2/3+2/9)×(5/8-7/16)
=(6/9+2/9)×(10/16-7/16)
=8/9×3/16
=1/6
6/7×5/8+3/8÷7/6
=5/8×6/7+3/8×6/7
=(5/8+3/8)×6/7
=1×6/7
=6/7
=1/6÷[9/17×(9/12+8/12)]
=1/6÷(9/17×17/12)
=1/6÷3/4
=1/6×4/3
=2/9
(2/3+2/9)×(5/8-7/16)
=(6/9+2/9)×(10/16-7/16)
=8/9×3/16
=1/6
6/7×5/8+3/8÷7/6
=5/8×6/7+3/8×6/7
=(5/8+3/8)×6/7
=1×6/7
=6/7
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