|x-2|-2.X=-1
các bạn giải nhanh nha
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\(A=x^2+x+1=x^2+2\cdot\dfrac{1}{2}\cdot x+\left(\dfrac{1}{2}\right)^2+\dfrac{3}{4}\)
\(A=\left(x+\dfrac{1}{2}\right)^2+\dfrac{3}{4}>0\)
A= x2 + x + 1
A = x2 + 2. \(\dfrac{1}{2}\). x + (\(\dfrac{1}{2}\))2 +\(\dfrac{3}{4}\)
A = ( x + \(\dfrac{1}{2}\))2 + \(\dfrac{3}{4}\) ≥ \(\dfrac{3}{4}\)
Vậy, x2 + x + 1>0 với mọi x
Đúng thì like giúp mik nha. Thx bạn
a) x/-2=-4/y=2/4
*x/-2=2/4=>4x=(-2)x2=>x=-1
*-4/y=2/4=>(-4)x4=2y=>y=-8
b)2/x=y/-3
=>xy=-6(câu này đề hơi lạ)
c) x+1/2=8/x+1
=>16=(x+1)(x+1)=>x^2+2x+1=16=>(x+1)^2=16=>(x+1)^2=4^2=>x+1=4=>x=3
\(=x^2\left(y+1\right)-\left(y+1\right)\)
=(y+1)(x-1)(x+1)
a: \(M=\dfrac{2\left(1-3x\right)\left(1+3x\right)}{3x\left(x+2\right)}\cdot\dfrac{3x}{2\left(1-3x\right)}=\dfrac{3x+1}{x+2}\)
a: Ta có: \(\left(x+3\right)\left(x+4\right)\left(x+5\right)\left(x+6\right)+1\)
\(=\left(x^2+9x+18\right)\left(x^2+9x+20\right)+1\)
\(=\left(x^2+9x\right)^2+38\left(x^2+9x\right)+360+1\)
\(=\left(x^2+9x\right)^2+2\cdot\left(x^2+9x\right)\cdot19+19^2\)
\(=\left(x^2+9x+19\right)^2\)
b. \(x^2+y^2+2x+2y+2\left(x+1\right)\left(y+1\right)+2\)
\(=\left(x^2+2x+1\right)+2\left(x+1\right)\left(y+1\right)+\left(y^2+2y+1\right)\)
\(=\left(x+1\right)^2+2\left(x+1\right)\left(y+1\right)+\left(y+1\right)^2\)
\(=\left(x+1+y+1\right)^2=\left(x+y+2\right)^2\)
c. \(x^2-2x\left(y+2\right)+y^2+4y+4\)
\(=x^2-2x\left(y+2\right)+\left(y+2\right)^2\)
\(=\left(x-y-2\right)^2\)
d. \(x^2+2x\left(y+1\right)+y^2+2y+1\)
\(=x^2+2x\left(y+1\right)+\left(y+1\right)^2\)
\(=\left(x+y+1\right)^2\)
2x+3 + 2x = 144
=> 2x(23 + 1) = 144
=> 2x . 9 = 144
=> 2x = 144 : 9
=> 2x = 16
=> 2x =24
=> x = 4
2x+3 + 2x=144
<=>2x.23+2x=144
<=>2x.(23+1)=144
<=>2x.9=144
<=>2x=16
<=>2x=24
=>x=4
vậy...
k mik nhé
thanks
\(-4.\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(-8x-36+8x-3-x-13=0\)
\(-x-52=0\)
\(x=-52\)
k mk nha
thank you very much
\(2.\left|-0,4x+1,27\right|+3,6=5,2\)
<=> \(2.\left|-0,4x+1,27\right|=1,6\)
<=> \(\left|-0,4x+1,27\right|=0,8\)
<=> \(\hept{\begin{cases}-0,4x+1,27=0,8\\-0,4x+1,27=-0,8\end{cases}}\)
<=> \(\hept{\begin{cases}x=1,175\\x=5,175\end{cases}}\)
2 . | - 0,4x + 1,27 | + 3,6 = 5,2
2 . | - 0,4x + 1.27 | = 5,2 - 3,6 = > = 1,6
0, 4x + 1,27 = 1,6 : 2 = > = 0,8
0,4x = 0,8 - 1,27 = > = - 0,47
x = - 0,47 : 0,4
x = -1,175
\(\left|x-2\right|-2x=-1\)
\(\left|x-2\right|=-1+2x=2x-1\)
Nếu \(x-2\ge0\Leftrightarrow x\ge2\)
\(\Rightarrow x-2=2x-1\)
\(\Rightarrow2x-x=1-2=-1\)
\(\Rightarrow x=-1\)(loại , trái với \(x\ge2\))
Nếu \(x-2< 0\Rightarrow x< 2\)
\(\Rightarrow2-x=2x-1\)
\(\Rightarrow3=3x\)
\(\Rightarrow x=1\)
Vậy x = 1
|x−2|−2x=−1
|x−2|=−1+2x=2x−1
Nếu x−2≥0⇔x≥2
⇒x−2=2x−1
⇒2x−x=1−2=−1
⇒x=−1(loại , trái với x≥2)
Nếu x−2<0⇒x<2
⇒2−x=2x−1