1+2+1=2*2=4 1+2+3+2+1=3*3=9 1+2+3+4+3+2+1=4*4=16计算:1+2+3+l+99+100+99++98+l+3+2+1=l是L
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![1+2+1=2*2=4 1+2+3+2+1=3*3=9 1+2+3+4+3+2+1=4*4=16计算:1+2+3+l+99+100+99++98+l+3+2+1=l是L](/uploads/image/z/1106442-18-2.jpg?t=1%2B2%2B1%3D2%2A2%3D4+1%2B2%2B3%2B2%2B1%3D3%2A3%3D9+1%2B2%2B3%2B4%2B3%2B2%2B1%3D4%2A4%3D16%E8%AE%A1%E7%AE%97%EF%BC%9A1%2B2%2B3%2Bl%2B99%2B100%2B99%2B%2B98%2Bl%2B3%2B2%2B1%3Dl%E6%98%AFL)
1+2+1=2*2=4 1+2+3+2+1=3*3=9 1+2+3+4+3+2+1=4*4=16计算:1+2+3+l+99+100+99++98+l+3+2+1=l是L
1+2+1=2*2=4 1+2+3+2+1=3*3=9 1+2+3+4+3+2+1=4*4=16计算:1+2+3+l+99+100+99++98+l+3+2+1=
l是L
1+2+1=2*2=4 1+2+3+2+1=3*3=9 1+2+3+4+3+2+1=4*4=16计算:1+2+3+l+99+100+99++98+l+3+2+1=l是L
1+2+3+l+99+100+99++98+l+3+2+1=100×100=10000
祝开心
100*100=100000
99x99=9801
可有前n项和的公式到出通项 (2/n*(n-1))*2-n=n^2
3(2^2+1)(2^4+1)(2^8+1)…(2^128+1)+1=?
1/2+1/3+1/4=?
1/2-3/1-4/1=
Sn=1+2*2+3*2^2+4*2^3+...+n*2^(n-1)=
1+2+3+4=
1+2+3+4=
1+2+3+4=?
-4/3×1/2=
-1+2-3+4=
1+2+3+4=
1+2+3+4=
(x-1/2)*2=3/4
1+(1/1+2)+(1/1+2+3)+(1/1+2+3+4)+(1/1+2+3+4+...+100)=?
3*(2^2+1)(2^4+1)(2^8+1)(2^16+1)...(2^2n+1)+1=
(2+1)+(2^2+1)(2^3+1)(2^4+1).(2^2n +1)+1=多少(要有过程)
1+2+3-4-5+1+1+2+3=
1/2+1/(2+3)+1/(2+3+4)+.+1/(2+4+5+...)200)=?
线性代数题,计算行列式(1)|4 2 2 2||2 4 2 2| =|2 2 4 2||2 2 2 4|(2)|1 1 1 1 ||1 2 3 4 | =|1 4 9 16||1 8 27 64|