1/2+1/2^2024
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Tính: \(S=C^0_{2024}+\dfrac{1}{2}.C^2_{2024}+\dfrac{1}{3}.C^4_{2024}+\dfrac{1}{4}.C^6_{2024}+...+\dfrac{1}{1013}.C^{2024}_{2024}\)
Tính: \(S=C^0_{2024}+\dfrac{1}{2}.C^2_{2024}+\dfrac{1}{3}.C^4_{2024}+\dfrac{1}{4}.C^6_{2024}+...+\dfrac{1}{1013}.C^{2024}_{2024}\)
Tính: \(S=C^0_{2024}+\dfrac{1}{2}.C^2_{2024}+\dfrac{1}{3}.C^4_{2024}+\dfrac{1}{4}.C^6_{2024}+...+\dfrac{1}{1013}.C^{2024}_{2024}\)
\(S=C^0_{2024}+\dfrac{1}{2}C^2_{2024}+\dfrac{1}{3}C^4_{2024}+\dfrac{1}{4}C^6_{2024}+...+\dfrac{1}{1013}C^{2024}_{2024}\)
Ta có :
\(\dfrac{1}{k+1}C^{2k-1}_n=\dfrac{1}{k+1}.\dfrac{n!}{\left(2k-1\right)!\left(n-2k+1\right)!}\)
\(=\dfrac{1}{n+1}.\dfrac{\left(n+1\right)!}{2k!\left[\left(n+1\right)-2k\right]!}\)
\(=\dfrac{1}{n+1}C^{2k}_{n+1}\)
\(\Rightarrow S_n=\dfrac{1}{n+1}\Sigma^{2k}_{k=0}C^{2k}_{n+1}=\dfrac{1}{n+1}\left(\Sigma^{2k}_{k=0}C^{2k-1}_{n+1}-C^0_{n+1}\right)=\dfrac{2^{2n-1}-1}{n+1}\)
\(\Rightarrow S=\dfrac{2^{2025}-1}{1013}\)
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Tính: \(S=C^0_{2024}+\dfrac{1}{2}.C^2_{2024}+\dfrac{1}{3}.C^4_{2024}+\dfrac{1}{4}.C^6_{2024}+...+\dfrac{1}{1013}.C^{2024}_{2024}\)
S = C₀₂₀₂₄ + 12.C₂₀₂₄ + 13.C₂₀₂₄ + 14.C₂₀₂₄ + ... + 11013.C₂₀₂₄
= (C₀₂₀₂₄ + C₂₀₂₄ + C₂₀₂₄ + C₂₀₂₄ + ... + C₂₀₂₄) + (C₂₀₂₄ + C₂₀₂₄ + C₂₀₂₄ + ... + C₂₀₂₄) + ... + (C₂₀₂₄)
= 11014.C₂₀₂₄
= 11014.
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Tính: \(S=C^0_{2024}+\dfrac{1}{2}.C^2_{2024}+\dfrac{1}{3}.C^4_{2024}+\dfrac{1}{4}.C^6_{2024}+...+\dfrac{1}{1013}.C^{2024}_{2024}\)
Tính: \(S=C^0_{2024}+\dfrac{1}{2}.C^2_{2024}+\dfrac{1}{3}.C^4_{2024}+\dfrac{1}{4}.C^6_{2024}+...+\dfrac{1}{1013}.C^{2024}_{2024}\)
Tính: \(S=C^0_{2024}+\dfrac{1}{2}.C^2_{2024}+\dfrac{1}{3}.C^4_{2024}+\dfrac{1}{4}.C^6_{2024}+...+\dfrac{1}{1013}.C^{2024}_{2024}\)
1+1/2*(1+2)+1/3*(1+2+3)+...+1/2024*(1+2+3+...+2024)
1+1/2.(1+2)+1/3.(1+2+3)+1/4.(1+2+3+4)+...+1/2023.(1+2+3+...+2023)
=1+1/2.(1+2).2/2+1/3.(1+3).3/2+1/4.(1+4).4/2+...+1/2023.(1+2+3+...+2023).2023/2
=2/2+3/2+4/2+...+2023/2
=2+3+4+...+2023/2
=2025.2022/2/2
=1023637,5
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CMR1×2-1/2!+2×3-1/2!+3×4-1/4!+...+2023×2024/2024!<2
TH1
42:x=6
x= 42 :6
X= 7
TH 2
36:x = 6
X = 36: 6
X= 6
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\(\dfrac{1}{2\sqrt{1}+1\sqrt{2}}+\dfrac{1}{3\sqrt{2}+2\sqrt{3}}+...+\dfrac{1}{2025\sqrt{2024}+2024\sqrt{2025}}\)
