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Nếu: m chẵn , n lẻ thì m + 2n + 1 chẵn => (m+2n+1)(3m-2n+2) chẵn (1)
Nếu: m lẻ , n chẵn thì m + 2n + 1 chẵn => (m+2n+1)(3m-2n+2) chẵn (2)
Nếu: m, n đều lẻ m + 2n + 1 chẵn => (m+2n+1)(3m-2n+2) chẵn (3)
Nếu: m,n đều chẵn 3m-2n+2 chẵn => (m+2n+1)(3m-2n+2) chẵn (4)
Từ (1),(2),(3),(4) suy ra với mọi m,n \(\in\) N thì A = (m+2n+1)(3m-2n+2) là số chẵn
\(Q=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{n}-\frac{1}{n+1}\)
\(Q=1-\frac{1}{n+1}=\frac{n}{n+1}\)
gọi d là UCLN của n,(n+1) ta có:
\(\hept{\begin{cases}n⋮d\\n+1⋮d\end{cases}\Rightarrow n+1-n⋮d\Rightarrow d=1}\)
=> Q là p/s tối giãn mà n khác 0 => Q ko thuộc Z
Đề là chứng minh N < 1/4 sẽ đúng hơn
Ta có :
\(N=\frac{1}{4^2}+\frac{1}{6^2}+\frac{1}{8^2}+...+\frac{1}{\left(2n\right)^2}\)
\(\Rightarrow2^2.N=\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{n^2}\)
Ta lại có :
\(4N=\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{n^2}< \frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{\left(n-1\right)n}=1-\frac{1}{n}\)
\(\Rightarrow N< \left(1-\frac{1}{n}\right):4=\frac{1}{4}\left(1-\frac{1}{n}\right)\)
Mà \(n\in N;n\ge2\)=> 1 -\(\frac{1}{n}\)< 1
=> \(N< \frac{1}{4}\left(1-\frac{1}{n}\right)< \frac{1}{4}\)
=> \(N< \frac{1}{4}\)( đpcm )
\(\frac{\left(\text{13}\frac{\text{1}}{\text{4}}-\text{2}\frac{\text{5}}{\text{27}}-\text{10}\frac{\text{5}}{\text{6}}\right).\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\left(\text{1}\frac{\text{3}}{\text{7}}+\frac{\text{10}}{\text{3}}\right):\left(\text{12}\frac{\text{1}}{\text{3}}-\text{14}\frac{\text{2}}{\text{7}}\right)}=\frac{\left[\text{13}\frac{\text{1}}{\text{4}}-\left(\text{2}\frac{\text{5}}{\text{27}}+\text{10}\frac{\text{5}}{\text{6}}\right)\right].\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{100}}{\text{21}}:\frac{\text{-41}}{\text{21}}}\)
\(=\frac{\left(\text{13}\frac{\text{1}}{\text{4}}-\text{13}\frac{\text{1}}{54}\right).\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{-100}}{\text{41}}}=\frac{\frac{\text{25}}{\text{108}}.\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{-100}}{\text{41}}}\)
\(=\frac{\text{53}\frac{\text{1}}{\text{4}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{-100}}{\text{41}}}=\frac{\text{100}}{\frac{-\text{100}}{\text{41}}}=\text{-41}\)
Giải :
\(\frac{\left(\text{13}\frac{\text{1}}{\text{4}}-\text{2}\frac{\text{5}}{\text{27}}-\text{10}\frac{\text{5}}{\text{6}}\right).\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\left(\text{1}\frac{\text{3}}{\text{7}}+\frac{\text{10}}{\text{3}}\right):\left(\text{12}\frac{\text{1}}{\text{3}}-\text{14}\frac{\text{2}}{\text{7}}\right)}=\frac{\left[\text{13}\frac{\text{1}}{\text{4}}-\left(\text{2}\frac{\text{5}}{\text{27}}+\text{10}\frac{\text{5}}{\text{6}}\right)\right].\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{100}}{\text{21}}:\frac{\text{-41}}{\text{21}}}\)
\(=\frac{\left(\text{13}\frac{\text{1}}{\text{4}}-\text{13}\frac{\text{1}}{54}\right).\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{-100}}{\text{41}}}=\frac{\frac{\text{25}}{\text{108}}.\text{230}\frac{\text{1}}{\text{25}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{-100}}{\text{41}}}\)
\(=\frac{\text{53}\frac{\text{1}}{\text{4}}+\text{46}\frac{\text{3}}{\text{4}}}{\frac{\text{-100}}{\text{41}}}=\frac{\text{100}}{\frac{-\text{100}}{\text{41}}}=\text{-41}\)
~~Học tốt~~
\(A=x^3+3x^2\left(y+z\right)+3x\left(y+z\right)^2+\left(y+z\right)^3+x^3-3x^2\left(y+z\right)+3x\left(y+z\right)^2-\left(y+z\right)^3\)
\(=2x^3+6x\cdot\left(y+z\right)^2\)
=B
a) \(\frac{81}{16}\)
b) \(\frac{-31}{8}\)
c) \(\frac{2417}{2401}\)
Bn làm đầy đủ ra giúp mik với !! Thầy mik bắt làm đầy đủ cơ !!!
\(A=\dfrac{\left(-2\right)^0+1^{2017}+\left(\dfrac{-1}{3}\right)^8.3^8}{2^{15}}=\dfrac{3}{2^{15}}\left(1\right)\)
\(B=\dfrac{6^2}{2^{16}}\left(2\right)\)
\(\left(1\right);\left(2\right)\Rightarrow\dfrac{A}{B}=\dfrac{\dfrac{3}{2^{15}}}{\dfrac{6^2}{2^{16}}}=\dfrac{1}{6}\)
Ta có: \(\left(2n-1\right)^3-2n+1=\left(2n-1\right)^3-\left(2n-1\right)\)
\(=\left(2n-1\right)\left(4n^2-4n+1-1\right)\)
\(=4n\left(n-1\right)\left(2n-1\right)\)
Ta có: \(4⋮4\Rightarrow4n\left(n-1\right)\left(2n-1\right)⋮4\) (1)
Mà \(n\left(n-1\right)\) là 2 số tự nhiên liên tiếp nên chia hết cho 2
\(\Rightarrow4n\left(n-1\right)\left(2n-1\right)⋮2\) (1)
Từ (1) và (2):
\(\Rightarrow4n\left(n-1\right)\left(2n-1\right)⋮8\)
Hay: \(A⋮8\)
=.= hok tốt!!