应该是12+56+1112+1920+.98999900吧?
那就是=1-12+1-16+1-112+1-120+.1-19900
=99-(-12+12-13+13-14+14-15+.+199-1100)
=99+1100
=9901100
数学1\2+5\6+11\12+9\20+.9890\9900怎么做
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相关问题
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数学2\1+6\5+12\11+20\9+.9900\9890怎么做
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1/2+5/6+11/12+19/20+.9890/9900=
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1/2+5/6+11/12+9/20+……+9899/9900
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1/2+5/6+11/12+19/20+...+9898/9900
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[1/2]+[5/6]+[11/12]+[19/20]+…+[9899/9900]=______．
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[1/2]+[5/6]+[11/12]+[19/20]+…+[9899/9900]=______．
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2\1+6\5+12\11+20\19+30\29...+9900\9899
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2/1+6/5+12/11+20/19+30/29+.+9702/9701+9900/9899
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数学计算题1/2+5/6+11/12+29/30+.....+9701/9702+9899/9900=?
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1.简便计算1/2+5/6+11/12+19/20+29/30.9701/9702+9899/9900=?(2890+5