1. -2⁵/₉+1²⁰/₂₁=-(23/9)+41/21=(-7*23+41*3)/63=(-161+123)=-38/63.
2. (-38 /63):1⁸/₄₉=(-38 /63):(57/49)=(-38*49)/(63*57)=-14/27.
3. 1⁷/₉:(-6)=(16/9):(-6)=-8/27.
4. -14/27-(-8/27)=(-14/27)+8/27=-6/27=-2/9.
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1. -2⁵/₉+1²⁰/₂₁=-(23/9)+41/21=(-7*23+41*3)/63=(-161+123)=-38/63.
2. (-38 /63):1⁸/₄₉=(-38 /63):(57/49)=(-38*49)/(63*57)=-14/27.
3. 1⁷/₉:(-6)=(16/9):(-6)=-8/27.
4. -14/27-(-8/27)=(-14/27)+8/27=-6/27=-2/9.