1*2/1+2*3/1+3*4/1+4*5/1+5*6/1+6*7/1+7*8/1+8*9/1+9*10/1等于多少?用简便方法
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![1*2/1+2*3/1+3*4/1+4*5/1+5*6/1+6*7/1+7*8/1+8*9/1+9*10/1等于多少?用简便方法](/uploads/image/z/144789-69-9.jpg?t=1%2A2%2F1%2B2%2A3%2F1%2B3%2A4%2F1%2B4%2A5%2F1%2B5%2A6%2F1%2B6%2A7%2F1%2B7%2A8%2F1%2B8%2A9%2F1%2B9%2A10%2F1%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95)
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1*2/1+2*3/1+3*4/1+4*5/1+5*6/1+6*7/1+7*8/1+8*9/1+9*10/1等于多少?用简便方法
1*2/1+2*3/1+3*4/1+4*5/1+5*6/1+6*7/1+7*8/1+8*9/1+9*10/1等于多少?用简便方法
1*2/1+2*3/1+3*4/1+4*5/1+5*6/1+6*7/1+7*8/1+8*9/1+9*10/1等于多少?用简便方法
1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1-1/10
=9/10