（6/13×1.7+7/13×1.7）÷7/10
=[（6/13+7/13）×1.7]÷7/10
=1×1.7÷0.7
=17/7
9×1/8÷9×1/8
=(9÷9)×(1/8×1/8)
=1×1/64
=1/64
1/8×58+1/8×41+1/8
=1/8×58+1/8×41+1/8×1
=1/8×(58+41+1)
=1/8×100
=12.5

愿对你有所帮助!我还想再问你几道题，可以吗？
14/15÷[﹙4/5+2/3﹚×10/11]
9.9×6.9-69×0.39
68*六十六分之六十七14/15÷[﹙4/5+2/3﹚×10/11]
=14/15÷﹙22/15×10/11)
=14/15÷4/3
=7/10

9.9×6.9-69×0.39
=9.9×6.9-6.9×3.9
=(9.9-3.9)×6.9
=6×6.9
=41.4

68×67/66(这个简便不会)没关系，谢谢你！不客气的