1/1x4+1/4x7+1/7x10+...+1/73x76=? 急啊······
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1/1x4+1/4x7+1/7x10+...+1/73x76=? 急啊······
![1/1x4+1/4x7+1/7x10+...+1/73x76=? 急啊······](/uploads/image/z/17089002-18-2.jpg?t=1%2F1x4%2B1%2F4x7%2B1%2F7x10%2B...%2B1%2F73x76%3D%3F+%E6%80%A5%E5%95%8A%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7)
1/1x4+1/4x7+1/7x10+...+1/73x76
=1/3(1-1/4+1/4-1/7+...+1/73-1/76)
=1/3*75/76
=25/76
=1/3(1-1/4+1/4-1/7+...+1/73-1/76)
=1/3*75/76
=25/76
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注:1x4、4x7、7x10等均为分母
1/1x4 +1/4x7+1/7x10+.+1/100x103 急用啊
1/1X4+1/4X7+1/7X10+...+1/100X103=
1/1X4+1/4X7+1/7X10+.+1/2002X2005=?
1X4/1+4X7/1+7X10/1+…+2005X2008/1=?
1/(1x4)+1/(4x7)+1/(7x10)+1/(10x13)简便运算 找规律 急
计算1/1x4+1/4x7+1/7x10+.+1/2002x2005+1/2005x2008
1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便
计算1/1x4+1/4x7+1/7x10+***+1/2007x2010
1/1x4+1/4x7+1/7x10+……+1/2005x2008
1/1x4+1/4x7+1/7x10+……+1/97x100
1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)