1) (1/2+2/3) × -5/6 =

2) 4/5:(-1/2+2/3)=
3) (12/13+1/2)-21/26
4) (-2/3)×3/4:4/5=
5) 1/2×(-2/3):3/4=
6) (1/2-4/5)×7/8+1/2)=
7) (-13/14)+(10/11-5/7)=
8) (-7/8)+4/7-3/5=
9) 3/4×5/6):(11/12-1/2)
10) 15/24×20/23+18/25-11/12
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1) (1/2+2/3) × -5/6 =