2-6/13÷9/26-2/3
=2-6/13×26/9-2/3
=2-4/3-2/3
=6/3-4/3-2/3
=0
(1/2+1/3)×(34/5-4/5)
=5/6×6
=5
542/5÷17
=272/5×1/17
=16/5
1/7×571/6
=1/7×343/6
=49/6
411/3×3/4+511/4×4/5
=124/3×3/4+205/4×4/5
=31+41
=72
1.黄老师1/5小时走了5/6千米。照这样计算，走12/5千米需要几小时？
12/5×1/5÷5/6
=12/25×6/5
=72/125
2.黄老师1/5小时走了5/6千米。照这样计算，3/4小时能走多少千米？
3/4×5/6÷1/5
=75/24
=25/8
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