5/12×5/6+7/12÷6/5
=5/12×5/6+7/12×5/6
=（5/12+7/12）×5/6
=1×5/6
=5/6
5分子?+2分子1/5分子4+2分子3
（1/3+1/6-1/8）×24
=1/3×24+1/6×24-1/8×24
=8+4-3
=9
10÷（5/9+1/6×4）
=10÷（5/9+2/3）
=10÷11/9
=90/11
7/9÷11/5+2/9×5/11
=7/9×5/11+2/9×5/11
=（7/9+2/9）×5/11
=1×5/11
=5/11
1/2×2/5+9/10÷9/10
=1/5+1
=1又1/5