1.tính giá trị biểu thức
A = 2024/1.2 + 2024/2.3 +2024/3.4 +....+2024/2023.2024
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(y - 1)2024 + |\(x+y-1\)| = 0
Vì (y - 1)2024 ≥ 0 ∀ y; |\(x+y-1\)| ≥ 0 ∀ \(x;y\)
(y - 1)2024 + |\(x+y-1\)| = 0 khi và chỉ khi
y - 1 = 0 và \(x+y-1\) = 0
y - 1 = 0 Suy ra y = 1. thay y = 1 vào biểu thức \(x+y-1=0\) ta có:
\(x+1-1=0\) ⇒ \(x=0-1+1\) \(x=0\)
Vậy \(x=0;y=1\) thay vào biểu thức A= \(x^{2024}\) + y2024 ta được:
A = 02024 + 12024 = 0 + 1 = 1
\(A=\dfrac{2024^{2023}+1}{2024^{2024}+1}\)
\(2024A=\dfrac{2024^{2024}+2024}{2024^{2024}+1}=\dfrac{\left(2024^{2024}+1\right)+2023}{2024^{2024}+1}=\dfrac{2024^{2024}+1}{2024^{2024}+1}+\dfrac{2023}{2024^{2024}+1}=1+\dfrac{2023}{2024^{2024}+1}\)
\(B=\dfrac{2024^{2022}+1}{2024^{2023}+1}\)
\(2024B=\dfrac{2024^{2023}+2024}{2024^{2023}+1}=\dfrac{\left(2024^{2023}+1\right)+2023}{2024^{2023}+1}=\dfrac{2024^{2023}+1}{2024^{2023}+1}+\dfrac{2023}{2024^{2023}+1}=1+\dfrac{2023}{2024^{2023}+1}\)
Vì \(2024>2023=>2024^{2024}>2024^{2023}\)
\(=>2024^{2024}+1>2024^{2023}+1\)
\(=>\dfrac{2023}{2024^{2023}+1}>\dfrac{2023}{2024^{2024}+1}\)
\(=>A< B\)
\(#PaooNqoccc\)
=2024.2024-2024.4046+2023.2023
=2024.(2024-2023)+2023.(2023-2024
=1-1
=0
\(S=C^0_{2024}+\dfrac{1}{2}C^2_{2024}+\dfrac{1}{3}C^4_{2024}+\dfrac{1}{4}C^6_{2024}+...+\dfrac{1}{1013}C^{2024}_{2024}\)
Ta có :
\(\dfrac{1}{k+1}C^{2k-1}_n=\dfrac{1}{k+1}.\dfrac{n!}{\left(2k-1\right)!\left(n-2k+1\right)!}\)
\(=\dfrac{1}{n+1}.\dfrac{\left(n+1\right)!}{2k!\left[\left(n+1\right)-2k\right]!}\)
\(=\dfrac{1}{n+1}C^{2k}_{n+1}\)
\(\Rightarrow S_n=\dfrac{1}{n+1}\Sigma^{2k}_{k=0}C^{2k}_{n+1}=\dfrac{1}{n+1}\left(\Sigma^{2k}_{k=0}C^{2k-1}_{n+1}-C^0_{n+1}\right)=\dfrac{2^{2n-1}-1}{n+1}\)
\(\Rightarrow S=\dfrac{2^{2025}-1}{1013}\)
S = C₀₂₀₂₄ + 12.C₂₀₂₄ + 13.C₂₀₂₄ + 14.C₂₀₂₄ + ... + 11013.C₂₀₂₄
= (C₀₂₀₂₄ + C₂₀₂₄ + C₂₀₂₄ + C₂₀₂₄ + ... + C₂₀₂₄) + (C₂₀₂₄ + C₂₀₂₄ + C₂₀₂₄ + ... + C₂₀₂₄) + ... + (C₂₀₂₄)
= 11014.C₂₀₂₄
= 11014.
\(A=\dfrac{2024}{1.2}+\dfrac{2024}{2.3}+\dfrac{2024}{3.4}+...+\dfrac{2024}{2023.2024}\)
\(A=2024.\left(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+...+\dfrac{1}{2023.2024}\right)\)
\(A=2024.\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{2023}-\dfrac{1}{2024}\right)\)
\(A=2024.\left(1-\dfrac{1}{2024}\right)\)
\(A=2024.\dfrac{2023}{2024}\)
\(A=\dfrac{2024}{1}.\dfrac{2023}{2024}\)
\(A=1.2023\)
\(A=2023\)
\(\Rightarrow\) Vậy \(A=2023\)