巧算 (3+1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)快
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/02 16:43:15
x){}u4
55 2RH*{MR> zzlȶ$aRA&}#8#]@đL +/.H̳ Nz
巧算 (3+1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)快
巧算 (3+1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)
快
巧算 (3+1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)快
(3+1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)
=(3-1)(3+1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)/2
=(3^2-1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)/2
=……
=(3^(2n+1)+1)/2
20-19+18-17+.+4-3+2-1巧算
巧算 50-49+48-47+.+4-3+2-1=
巧算1+2+3+4+5.+50等于多少
巧算:50-49+48-47+…+4-3+2-1
巧算; 1+6+8+4+2+7+3+9=
巧算1+2+3+4+.+2005+2006+2007+2008=?
巧算24点1:3:4:6
巧算:1/1*2+1/2*3+1/3*4+.+1/99*100等于多少?
巧算;1/2*1+1/2*3+1/3*4+.1/56*57
巧算1/1×2+1/2×3+1/3×4+…1/49×50
巧算 (3+1)(3^2+1)(3^4+1)(3^5+1)……(3^2n+1)快
巧算:1×2×3+2×3×4+3×4×5+…+10×11×12
1×2/1+2×3/1+3×4/1+4×5/1+5×6/1巧算
巧算 1/1×2+1/2×3 +1/3×4 +1/4×5 +…+ 1/19×20
巧算(1- 1/2 )( 1/3 -1)(1- 1/4 )( 1/5 -1)…( 1/2003 -1)(1- 1/2004 )
巧算(1/(2/3)/(3/4)/(4/5)/(5/6)/./(1999/2000)/(2000/2001)/(2001/2002)
巧算(*表示乘号)1*2*3+2*3*4+3*4*5+…+10*11*12 巧算3-6+9-12+…1995-1998+2001-2004
巧算:1/1*2+1/2*3+1/3*4+……1/19*20+1/20*21=