求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,我采纳!急用!
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求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,我采纳!急用!
求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,我采纳!急用!
求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,我采纳!急用!
Sn=1×2+3×2^2+5×2^3+...+(2n-1)×2^n
2Sn=1×2^2+3×2^3+...+(2n-3)×2^n+(2n-1)×2^n
Sn-2Sn=-Sn=-2+2×2+2×2^2+...+2×2^n-(2n-1)×2^n=-2+2(2^n-1)/(2-1)-(2n-1)×2^n
Sn=(2n-3)×2^n+4
求和Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n
求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,我采纳!急用!
求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,急用!
2^5+5x2^4+10x2^3+10x2^2+5x2+1
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4x2-3y2+2xy-4x2+5x2
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已知x2-4x+1=0,求x2/(x2)2-3x2+1
Sn=1x2+3x2^2+5x2^3+...+(2n-1)2^n
解方程:(X2+2)/(2X2-1)-3(2X2-1)/(X2+2)+2=0 3x2+15x+2根号下(x2+5x+1)=2(X2+2)/(2X2-1)-3(2X2-1)/(X2+2)+2=03x2+15x+2根号下(x2+5x+1)=2
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708
x2-4x+3分之x2-5x+6+s2-2x+1分之x2-4x+3+1-x2分之x2-3x-4的过程