10+20+30+40+50+60+70+80+90+100=?为什么?
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10+20+30+40+50+60+70+80+90+100=?为什么?
10+20+30+40+50+60+70+80+90+100=?为什么?
10+20+30+40+50+60+70+80+90+100=?为什么?
10+20+30+40+50+60+70+80+90+100
=(10+100)*10/2
=110*5
=550
550
用(100+10)*5=550
=10+90+20+80+30+70+60+40+100+50
=5*100+50
=550