原式=1/2-1/3+1/3-1/4+1/4-1/5+...+1/99-1/100
=1/2-1/100
=49/100
1 1 1 1 1 ——＋——＋——＋——＋```````` —— 2X3 3X4 4X5 5X6 99X100
1个回答
相关问题
-
1/2X1/3+1/3X1/4+1/4X1/5+1/5X1/6+.+1/99X1/100=?
-
1/1X2+1/3X4+1/5X6+……+1/99X100=?
-
1/2X3X4X5+1/3X4X5X6+1/4X5X6X7.1/97X98X99X100=?
-
1X1+2X2+3X3+4X4+5X5.+98X98+99X99+100X100=?
-
[1/1x2]+[1/2x3]+[1/3x4]+[1/4x5]+…+[1/99x100]．
-
[1/1x2]+[1/2x3]+[1/3x4]+[1/4x5]+…+[1/99x100]．
-
[1/1x2]+[1/2x3]+[1/3x4]+[1/4x5]+…+[1/99x100]．
-
1/2x1/3+1/3x1/4+1/4x1/5……+1/99x1/100=?
-
必采纳2x3/1+3x4/1+4x5/1+……+99x100=
-
简便计算1/2+1/2x3+1/3x4+1/4x5+...+1/99x100