1 8/13÷7+1/7×6/13
=（8/13+6/13）×1/7
=14/13×1/7
=2/13
2 2-6/13÷9/29-2/3
=2-58/39-2/3
=20/39-2/3
=-2/13
3 5/12×（5/6+3/4）+4/5
=5/12×19/12+4/5
=95/144+4/5
=1051/720
1 8/13÷7+1/7×6/13 2 2-6/13÷9/29-2/3 3 5/12×（5/6+3/4）+4/5
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