1/2x1/3+1/3x1/4+1/4x1/5……+1/99x1/100
=1/2-1/3+1/3-1/4+1/4-1/5……+1/99-1/100
=1/2-1/100
=49/100
1/2x1/3+1/3x1/4+1/4x1/5……+1/99x1/100=?
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相关问题
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[1/1x2]+[1/2x3]+[1/3x4]+[1/4x5]+…+[1/99x100]．
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[1/1x2]+[1/2x3]+[1/3x4]+[1/4x5]+…+[1/99x100]．
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[1/1x2]+[1/2x3]+[1/3x4]+[1/4x5]+…+[1/99x100]．
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1 1 1 1 1 ——＋——＋——＋——＋```````` —— 2X3 3X4 4X5 5X6 99X100
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1/2X1/3+1/3X1/4+1/4X1/5+1/5X1/6+.+1/99X1/100=?
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1x1+0x1+2x2+1x2+3x3+2x3+4x4+3x4……99x99+98x99+100x100+99x100
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简便计算1/2+1/2x3+1/3x4+1/4x5+...+1/99x100
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1/1X2+1/3X4+1/5X6+……+1/99X100=?
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必采纳2x3/1+3x4/1+4x5/1+……+99x100=
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计算：1 1 1 1 1 ——+ ——+——+.+————+———— 1x2 2x3 3x4 99x100 100x10