(-1)^1+(-1)^2+(-1)^3+(-1)^4+…+(-1)^99+(-1)^100
(-1)^1+(-1)^2+(-1)^3+(-1)^4+…+(-1)^99+(-1)^100
1/2*1+1*2*3+1/3*4+………+1/99*100
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+1/1+2+1/1+2+3+…+1/1+2+3+4+…+99+100等于多少?
1×2/1+2×3/1+3×4/1……+99×100/1
|1-1/2|+|1/2-1/3|+|1/3-1/4|+……+|1/99-1/100|
计算:|1-1/2|+|1/2-1/3|+|1/3-1/4|+……+|1/99-1/100|
计算下列式子:|1/2-1|+|1/3-1/2|+|1/4-1/3|+……+|1/100-1/99|
求1-1/2+1/3-1/4…+1/99-1/100的值
(1-1/2)(1-1/3)(1-1/4).(1-1/99)(1-1/100)等于?
1/1*2+1/2*3+1/3*4+…+1/99*100=?
计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2)