0.75×5/6÷10/11
=3/4×5/6×11/10
=5/8×11/10
=11/16
5/18×5/6+13/18÷6/5
=5/18×5/6+13/18×5/6
=(5/18+13/18)×5/6
=1×5/6
=5/6
7÷7/10-7/10÷7
=7×10/7-7/10×1/7
=10- 1/10
=9又9/10
[2-(1/2+2/3)]÷2/3
=(2-7/6)×3/2
=5/6×3/2
=5/4
10÷[(4/5+7/10)÷1/10]
=10÷(3/2 ×10)
=10÷15
=2/3