计算下面各题？
2个回答
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2/3÷5/9×3/4
=2/3×9/5×3/4
=6/5×3/4
=9/10
18÷2/3 ÷ 54/5
=18×3/2×5/54
=27×5/54
=5/2
=2又1/2
5/6×4/9÷6/7
=5/6×4/9×7/6
=10/27×7/6
=35/81
49/60 ÷ 7/4 ×9
=49/60×4/7×9
=7/15×9
=21/5
=4又1/5
=2/3×9/5×3/4
=6/5×3/4
=9/10
18÷2/3 ÷ 54/5
=18×3/2×5/54
=27×5/54
=5/2
=2又1/2
5/6×4/9÷6/7
=5/6×4/9×7/6
=10/27×7/6
=35/81
49/60 ÷ 7/4 ×9
=49/60×4/7×9
=7/15×9
=21/5
=4又1/5
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