3^3-4×3^2+10×3=21
3个回答
3^2004-4×3^2003+10×3^2002=7×3^2002
3^n+2 - 4×3^3n+1 + 10×3^n=7×3^n
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1/1×2×3+1/2×3×4+1/3×4×5+.1/20×21×22解答