15/1+16/1+17/1+18/1+19/1=?
15/1+16/1+17/1+18/1+19/1=?
20-19+18-17+16-15+14-.-2+1=?
A=1\10+1\11+1\12+1\13+1\+1\14+1\15+1\16+1\17+1\18+1\19分之1 求A
1/11+1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19+1/20=?
(1-12)(1-13)(1-14)(1-15)(1-16)(1-17)(1-18)(1-19)0.1+0.2+0.3+
(1+1/16+1/17+1/18)x(1/16+1/17+1/18+1/19)-(1+1/16+1/17+1/18+1
(1+1/16+1/17+1/18)×(1/16+1/17+1/18+1/19)-(1+1/16+1/17+1/18+1
(1+1/16+1/17+1/18)*(1/16+1/17+1/18+1/19)-(1+1/16+1/17+1/18+1
20×20-19×19+18×18-17×17+16×16-15×15+14×14...+2×2-1×1 怎么算?
[(1+x)^20+(1+x)^19+(1+x)^18+(1+x)^17+(1+x)^16+(1+x)^15+(1+x)
1/16*17+1/17*18+1/18*19+1/19*20=?请写一下解答技巧,谢谢!!
1/1/10 1/11 1/12 1/13 1/14 1/15 1/16 1/17 1/18 1/19化简后整数部分是多