Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n sn=2sn-sn我想知道2SN等于多于.尤其是(2n-1)x2^n 除以2等于多少.
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Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n sn=2sn-sn我想知道2SN等于多于.尤其是(2n-1)x2^n 除以2等于多少.
Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n sn=2sn-sn
我想知道2SN等于多于.尤其是(2n-1)x2^n 除以2等于多少.
Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n sn=2sn-sn我想知道2SN等于多于.尤其是(2n-1)x2^n 除以2等于多少.
2sn=2x2+3x2^2x2+5x2^3x2(2n-1)x2^nx2
sn = 2sn-sn=2x2^2+2x2^3+…+2x2^n-1x2
用错位相消
求和Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n
Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n sn=2sn-sn我想知道2SN等于多于.尤其是(2n-1)x2^n 除以2等于多少.
Sn=1x2+3x2^2+5x2^3+...+(2n-1)2^n
若 x2-3x+1=0,求(2x2×x3-5x2×x2+2 x3-8x2 )÷(x2+1 )的值
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