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11 tháng 4 2019

\(\left(x+2\right)^{n+1}=\left(x+2\right)^{n+11}\)

\(\Leftrightarrow\orbr{\begin{cases}x+2=1\\x+2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=-1\\x=-2\end{cases}}}\)

11 tháng 4 2019

\(\left(x+2\right)^{n+1}-\left(x+2\right)^{x+11}=0\\ \Leftrightarrow\left(x+2\right)^{n+1}\left(1-\left(x+2\right)^{10}\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}\left(x+2\right)^{n+1}=0\\1-\left(x+2\right)^{10}=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-2\\\left(x+2\right)^{10}=1\Rightarrow x+2=-1\Rightarrow x=-3\end{cases}}}\)

1 tháng 3 2023

(\(x\) + 2)n+1 = ( \(x\) + 2)n+11

(\(x+2\))n+1 -  ( \(x\) + 2)n+11 = 0

(\(x\) + 2)n+1.(  1 + (\(x\) + 2)10) = 0

(\(x\) + 2)10 + 1 > 0 ∀ \(x\)

=> (\(x\) + 2)n+1 = 0 ⇒ \(x\) + 2  = 0 ⇒ \(x\) = -2

vậy \(x\) = -2

3 tháng 6 2015

b) 3x - 6 - (8x + 4) - (10x + 15) = 50

=> 3x - 6 - 8x - 4 - 10x - 15  = 50

=> (3x - 8x - 10x)  =  6+ 4 + 15 + 50

=> -15x = 75 => x = 75 : (-15) = -5

c) => 2x - 3 = 2 - x hoặc 2x - 3 = - (2 - x) (Vì 2 số  có giá trị tuyệt đối bằng nhau thì chings bằng nhau hoặc đối nhau)

+) nếu 2x - 3 = 2 - x => 2x+ x = 2 + 3 => 3x = 5 => x = 5/3

+) nếu 2x - 3 = -(2 - x) => 2x - 3 = -2 + x => 2x - x = -2 + 3 => x = 1

Vậy x = 5/3 hoặc x = 1

3 tháng 6 2015

a) (n-1)n+11-(n-1)n=0

(n-1)n(n-1)11-(n-1)n=0

(n-1)n[(n-1)11-1]=0

(n-1)n=0 hoặc (n-1)11-1=0

n-1=0   hoặc  (n-1)11   =1

n=1      hoặc  n-1         =1

n=1      hoặc   n          =2

9 tháng 4 2019

\(\left(x+2\right)^{n+1}=\left(x+2\right)^{n+11}\)

\(\Leftrightarrow\left(x+2\right)^{n+1}-\left(x+2\right)^{n+11}=0\)

\(\Leftrightarrow\left(x+2\right)^{n+1}-\left(x+2\right)^{n+1}\cdot\left(x+2\right)^{10}=0\)

\(\Leftrightarrow\left(x+2\right)^{n+1}\left[1-\left(x+2\right)^{10}\right]=0\)

\(\Leftrightarrow\orbr{\begin{cases}\left(x+2\right)^{n+1}=0\\1-\left(x+2\right)^{10}=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x+2=0\\x+2\in\left\{\pm1\right\}\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=-2\\x\in\left\{-1;-3\right\}\end{cases}}\)

Vậy....

=> (x+2)n+11:(x+2)n+1=1

<=> (x+2)10=1

th1:x+2=1

<=>x=-1

th2:x+2=-1

<=>x=-3

vậy x=-1 hoặc x=-3

21 tháng 9 2021

\(c,\Rightarrow\left[{}\begin{matrix}-2\left(x+2\right)+\left(4-x\right)=11\left(x< -2\right)\\2\left(x+2\right)+\left(4-x\right)=11\left(-2\le x\le4\right)\\2\left(x+2\right)+\left(x-4\right)=11\left(x>4\right)\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{11}{3}\left(tm\right)\\x=3\left(tm\right)\\x=\dfrac{11}{3}\left(ktm\right)\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=-\dfrac{11}{3}\end{matrix}\right.\)

21 tháng 9 2021

\(a,\Rightarrow\left[{}\begin{matrix}x+\dfrac{5}{2}=3x+1\\x+\dfrac{5}{2}=-3x-1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{3}{4}\\x=-\dfrac{7}{8}\end{matrix}\right.\)

 

3 tháng 6 2019

\(C=\frac{7}{9}x^3y^2\left(\frac{6}{11}axy^3\right)+\left(-5bx^2y^4\right)\left(\frac{-1}{2}axz\right)+ax\left(x^2y\right)^3\)

\(\Rightarrow C=\frac{42}{9}ax^4y^5+\frac{5}{2}abx^3y^4z+ax\left(x^6y^3\right)\)

\(\Rightarrow C=\frac{42}{9}ax^4y^5+\frac{5}{2}abx^3y^4z+ax^7y^3\)

\(D=\frac{\left(3x^4y^4\right)^2\left(\frac{6}{11}x^3y\right)\left(8x^{n-7}\right)\left(-2x^{7-n}\right)}{15x^3y^2\left(0,4ax^2y^2z^2\right)^2}\)

\(D=\frac{\left[3.\frac{6}{11}.8.\left(-2\right)\right]\left(x^8x^3x^{n-7}x^{7-n}\right)\left(y^8y\right)}{15.0,4.\left(x^3x^4\right)\left(y^2y^4\right)z^4a}\)

\(D=\frac{\frac{-188}{11}x^{24}y^9}{6x^7y^6z^4a}\)

HQ
Hà Quang Minh
Giáo viên
19 tháng 9 2023

a)

\(\begin{array}{l}x:{\left( {\frac{{ - 1}}{2}} \right)^3} =  - \frac{1}{2}\\x =  - \frac{1}{2}.{\left( {\frac{{ - 1}}{2}} \right)^3}\\x = {\left( {\frac{{ - 1}}{2}} \right)^4}\\x = \frac{1}{{16}}\end{array}\)              

Vậy \(x = \frac{1}{{16}}\).

 b)

\(\begin{array}{l}x.{\left( {\frac{3}{5}} \right)^7} = {\left( {\frac{3}{5}} \right)^9}\\x = {\left( {\frac{3}{5}} \right)^9}:{\left( {\frac{3}{5}} \right)^7}\\x = {\left( {\frac{3}{5}} \right)^2}\\x = \frac{9}{{25}}\end{array}\)

Vậy \(x = \frac{9}{{25}}\).

c)

\(\begin{array}{l}{\left( {\frac{{ - 2}}{3}} \right)^{11}}:x = {\left( {\frac{{ - 2}}{3}} \right)^9}\\x = {\left( {\frac{{ - 2}}{3}} \right)^{11}}:{\left( {\frac{{ - 2}}{3}} \right)^9}\\x = {\left( {\frac{{ - 2}}{3}} \right)^2}\\x = \frac{4}{9}.\end{array}\)         

Vậy \(x = \frac{4}{9}\).

d)

\(\begin{array}{l}x.{\left( {0,25} \right)^6} = {\left( {\frac{1}{4}} \right)^8}\\x.{\left( {\frac{1}{4}} \right)^6} = {\left( {\frac{1}{4}} \right)^8}\\x = {\left( {\frac{1}{4}} \right)^8}:{\left( {\frac{1}{4}} \right)^6}\\x = {\left( {\frac{1}{4}} \right)^2}\\x = \frac{1}{{16}}\end{array}\)

Vậy \(x = \frac{1}{{16}}\).

24 tháng 4 2017

\(\left(x+2\right)^{n+1}=\left(x+2\right)^{n+11}\)

\(\Rightarrow\left(x+2\right)^{n+11}-\left(x+2\right)^{n+1}=0\)

\(\Rightarrow\left(x+2\right)^{n+1}\left[\left(x+2\right)^{10}-1\right]=0\)

\(\Rightarrow\left[{}\begin{matrix}\left(x+2\right)^{n+1}=0\\\left(x+2\right)^{10}-1=0\end{matrix}\right.\)

+) \(\left(x+2\right)^{n+1}=0\Rightarrow x+2=0\Rightarrow x=-2\)

+) \(\left(x+2\right)^{10}-1=0\Rightarrow\left(x+2\right)^{10}=1\)

\(\Rightarrow\left[{}\begin{matrix}x+2=1\\x+2=-1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=-1\\x=-3\end{matrix}\right.\)

Vậy \(x\in\left\{-2;-1;-3\right\}\)