(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)
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(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/
(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)
(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)
(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)
=(-1/2)+(9/2)-(9又1/2)+(9又3/4)
=(9/2)-(1/2)-9+9+(3/4-2/4)
=4+1/4
=4又1/4
=3/2-1/2+18/5+39/5-2/5
=1+(18+39-2)/5
=1+11
=12
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1+5+5+5+5+3+2+2+2+2+2+2+1+2+5
1-3/5+1/2-2/5
1、2、3、5,
[-2*1/4+(-1/2)3]*(-2*2/3)+(-1*2/3)2÷5/3
(-2/3)+1/2+4/5+(-1/2)+(-1/3)
1 2 3 4 5 1 2
1+1+2+2+3+4+5
1+1+2+3*5
(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)
2^1/2 、3^1/3 和5^1/5
计算1^2-2^2+3^2-4^2+5^2-6^2+...+(2n-1)^2-(2n)^2
3/(1^2)+5/(1^2+2^2)+7/(1^2+2^2+3^2)+.+(2n+1)/(1^2+2^2+.n^2)=?
1^2+3^2+5^2+.+N^2=多少
2+ 2^3 +2^5 +...+(2^2n-3) +(2^2n-1)=?
1*2^1+2*2^2+3*2^3+4*2^4+5*2^5+.+2012*2^2012=?
(1/2)^-2-(1/根号5+2)^0+(3X10^-2)^4/(3X10^-5)^2
化简:(2x+1)^2+5(x-1)^2-(3x+2)(3x-2)+2
1/2+3/2^2+5/2^3+...+(2n-1)/2^n=