1/1*2+1/2*3+.+1/49*50
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1/1*2+1/2*3+.+1/49*501/1*2+1/2*3+.+1/49*501/1*2+1/2*3+.+1/49*501/1*2+1/2*3+.+1/49*50=(1-1/2)+(1/2-1/
1/1*2+1/2*3+.+1/49*50
1/1*2+1/2*3+.+1/49*50
1/1*2+1/2*3+.+1/49*50
1/1*2+1/2*3+.+1/49*50
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+1/49-1/50)
=1-1/50=49/50
=(1-1/2)+(1/2-1/3)+……+(1/49-1/50)
中间正负抵消
=1-1/50
=49/50
49/50
1/1×2×3+1/2×3×4+1/3×4×5+.+1/48×49×50
3,0,1,5,1,5,7,2,49,,,
49、50、1、2、3
(1)计算1/1*2+1/2*3+1/3+4.+1/99*100 (2)1/1*3+1/3*5+1/5*7.+1/49*51
1/1×2+1/3×5+1/5×7+.+1/49×51=?
1/(3+3^1/2)+1/(5*3^1/2+3*5^1/2)+1/(7*5^1/2+5*7^1/2)+...+1/(49*47^1/2+47*49^1/2)
1/(1*3) 1/(2*4) 1/(3*5) ...1/(49*51
1/1×3+1/2×4+1/3×5+.+1/49×51
1/1×1/2×1/3+1/2×1/3×1/4+1/3×1/4×1/5+...+1/48×1/49×1/50
1/1*2+1/2*3+.+1/49*50
1/1*2+1/2*3+.+1/49*50
1/1*2*3+1/2*3*4+1/3*4*5+1/4*5*6---------+1/48*49*50
1/2*3+1/3*4+1/4*5……+1/48*49+1/49*50是多少
1+1+2+3+.+49+50=
1/1x3+1/3x5+1/5x7+.1/49x51 为什么除2
(1/50-1)(1/49-1)(1/48-1)…(1/3-1)(1/2-1)
1*2/1+2*3/1+3*4/1+.+2004*2005/1=1*3/1+3*5/1+5*7/1+.+49*51/1=
(2/7+3/2)÷9/49-1,5