1/2*3+1/4*5+1/6*7+...+1/98*99+1/51+1/52+1/53+...1/99
1/2*3+1/4*5+1/6*7+...+1/98*99+1/51+1/52+1/53+...1/99
1-1/2+1/3-1/4+1/5-1/6…+1/99-1/100)/(1/51+1/52+1/53+…+1/99+1/
(1+1\2*3+1\3*5+1\4*7+.+1\50*99)\(1\51+1\52+1\53+.+1\100)怎么解?
求教奥数题:分子是1+1/2*3+1/3*5+1/4*7+...+1/50*99,分母是1/51+1/52+1/53+.
(1/1*2+1/3*4+1/5*6+1/7*8+...+1/99*100)/(1/51+1/52+...+1/100)
【1/(1*2)+1/(3*4)+1/(5*6)+1/(7*8)+……1/(99*100)】/(1/51+1/52+……
1+2-3+4-5+6-7+.+98-99+100
1+2-3+4-5+6-7+^+98-99+100
1/2*3+1/4*5+1/5*6+.+1/98*98+1/51+1/52+.1/100得多少?
(1+1/1*3)*(1+1/2*4)*(1+1/3*5).(1+1/98*100)*(1+1/99*101)
(1+1/1+3)*(1+1/2*4)*(1+1/3*5)*.*(1+1/98*100)*(1+1/99*101)
1/1×2+1/2×3+1/3×4+1/4×5+.+1/98×99+1/99×100=?