x^2n+3-x^2n+2+x^2n+1
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x^2n(x^2-2n-2x^1-2n+x^-2n)
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求和:Sn=1-3x+5x^2-7x^3+.+(2n+1)(-x)^n(n属于N*)
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信号与系统中 y(n)=x(n)+x(n+1)如果|x(n)|≤M, 则|y(n)|≤|x(n)|+|x(n+1)|≤2