（1/3-1/4）÷1/8+5/6
=(1/3-1/4)×8+5/6
=1/3×8-1/4×8+5/6
=8/3-2+5/6
=2/3+5/6
=3/2
8-5/9-9/1*4
=8-5/9-4/9
=8-(5/9+4/9)
=8-1
=7
（1/2-1/3+1/6）*24
=1/2×24-1/3×24+1/6×24
=12-8+4
=8
4/9÷｛4/5-（1/5+1/3）｝
=4/9÷{4/5-1/5-1/3}
=4/9÷{3/5-1/3}
=4/9÷4/15
=4/9×15/4
=5/3