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1000-80-40-60-20巧算下面各题等于多少

1000-80-40-60-20 =1000-(80+20)-(60+40) =1000-100-100 =800

1000-80-70-60-50-40-30-20 =1000-(80+70+60+50+40+30+20) =1000-50×7 =1000-350 =650

1000-10-20-30-40-50-60-70-80-90 =1000-(10+20+30+40+50+60+70+80+90) =1000-(10+90)x9÷2 =1000-100x9÷2 =1000-450 =550

巧算1000减90减80减20减10 1000-90-80-20-10 =1000-(90+10)-(80+20) =1000-100-100 =800

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