2/3×3/4×10×1/2
1,(3×10^-6)^2·(-2×10^4)^3
1/1*2*3+1/2*3*4+1/3*4*5+.+1/8*9*10
(-4/1-3)^2+10=?
1 2 3 4 5 =10
计算1+2/3+3/3^2+4/3^3+…+11/3^10
求1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+……+(1/10+2/10
1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+…+(1/10+2/10+…
1/2+2/4+3/8+4/16+.+10/1024
2/1*4+2/4*7+2/7*10+2/10*13+.+2/(3n-2)(3n+1)
1+2-1+3-5+2-6-3-4+10+10+3-45=?
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
|1-1/2|-|1/2-1/3|-|1/3-1/4|-.-|1/9-1/10|