①﹣4²×5／8-﹙-5﹚÷2³×﹙﹣4﹚³
=-16×5/8+5÷8×(-64)
=-10-40
=-50
②18+32÷﹙-2﹚³-﹙-4﹚²×5
=18+32÷(-8)-16×5
=18-4-80
=-66
③﹙﹣3﹚²-1／5×5／9+﹙﹣2﹚³×3
=9-1/9+(-8)×3
=8又8/9-24
=-15又1/9