tìm x,y thỏa mãn
a) (x-1)2+(y+3)4=0
b) /x+3y-1/ + (3y-2)2016=0
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\(a,\left\{{}\begin{matrix}\left|x-3y\right|\ge0\\\left|y+4\right|\ge0\end{matrix}\right.\Rightarrow VT\ge0\)
Dấu \("="\Leftrightarrow\left\{{}\begin{matrix}x-3y=0\\y+4=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=3y=-12\\y=-4\end{matrix}\right.\)
\(b,Sửa:\left|x-y-5\right|+\left(y+3\right)^2=0\\ \left\{{}\begin{matrix}\left|x-y-5\right|\ge0\\\left(y+3\right)^2\ge0\end{matrix}\right.\Rightarrow VT\ge0\)
Dấu \("="\Leftrightarrow\left\{{}\begin{matrix}x-y-5=0\\y+3=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=y+5=2\\y=-3\end{matrix}\right.\)
\(c,\left\{{}\begin{matrix}\left|x+y-1\right|\ge0\\\left(y-2\right)^4\ge0\end{matrix}\right.\Rightarrow VT\ge0\)
Dấu \("="\Leftrightarrow\left\{{}\begin{matrix}x+y-1=0\\y-2=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1-y=-1\\y=2\end{matrix}\right.\)
\(d,\left\{{}\begin{matrix}\left|x+3y-1\right|\ge0\\3\left|y+2\right|\ge0\end{matrix}\right.\Rightarrow VT\ge0\)
Dấu \("="\Leftrightarrow\left\{{}\begin{matrix}x+3y-1=0\\y+2=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1-3y=7\\y=-2\end{matrix}\right.\)
\(e,Sửa:\left|2021-x\right|+\left|2y-2022\right|=0\\ \left\{{}\begin{matrix}\left|2021-x\right|\ge0\\\left|2y-2022\right|\ge0\end{matrix}\right.\Rightarrow VT\ge0\)
Dấu \("="\Leftrightarrow\left\{{}\begin{matrix}2021-x=0\\2y-2022=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2021\\y=1011\end{matrix}\right.\)
a) Có \(\left|x-3y\right|^5\ge0\);\(\left|y+4\right|\ge0\)
\(\rightarrow\left|x-3y\right|^5+\left|y+4\right|\ge0\)
mà \(\left|x-3y\right|^5+\left|y+4\right|=0\)
\(\rightarrow\left\{{}\begin{matrix}\left|x-3y\right|^5=0\\\left|y+4\right|=0\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}x=3y\\y=-4\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}x=-12\\y=-4\end{matrix}\right.\)
b) Tương tự câu a, ta có:
\(\left\{{}\begin{matrix}\left|x-y-5\right|=0\\\left(y-3\right)^4=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=y+5\\y=3\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=8\\y=3\end{matrix}\right.\)
c. Tương tự, ta có:
\(\left\{{}\begin{matrix}\left|x+3y-1\right|=0\\\left|y+2\right|=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=1-3y\\y=-2\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=7\\y=-2\end{matrix}\right.\)
a. \(\left|x-3y\right|^5\ge0,\left|y+4\right|\ge0\Rightarrow\left|x-3y\right|^5+\left|y+4\right|\ge0\) \(\Rightarrow VT\ge VP\)
Dấu bằng xảy ra \(\Leftrightarrow\left\{{}\begin{matrix}\left|x-3y\right|^5=0\\\left|y+4\right|=0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=3y\\y=-4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=-12\\y=-4\end{matrix}\right.\) Vậy...
b. \(\left|x-y-5\right|\ge0,\left(y-3\right)^4\ge0\Rightarrow\left|x-y-5\right|+\left(y-3\right)^4\ge0\) \(\Rightarrow VT\ge VP\)
Dấu bằng xảy ra \(\Leftrightarrow\left\{{}\begin{matrix}\left|x-y-5\right|=0\\\left(y-3\right)^4=0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=y+5\\y=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=8\\y=3\end{matrix}\right.\) Vậy ...
c. \(\left|x+3y-1\right|\ge0,3\cdot\left|y+2\right|\ge0\Rightarrow\left|x+3y-1\right|+3\left|y+2\right|\ge0\) \(\Rightarrow VT\ge VP\) Dấu bằng xảy ra \(\Leftrightarrow\left\{{}\begin{matrix}\left|x+3y-1\right|=0\\3\left|y+2\right|=0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=1-3y\\y=-2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1-\left(-2\right)\cdot3=7\\y=-2\end{matrix}\right.\) Vậy...
a) \(2x^2+2x+1=0\)
\(\Rightarrow2x^2+2x=-1\)
\(\Rightarrow2x\left(x+1\right)=-1\)
⇒ Pt vô nghiệm
a: \(2x^2+2x+1=0\)
\(\text{Δ}=2^2-4\cdot2\cdot1=4-8=-4< 0\)
Vì Δ<0 nên phương trình vô nghiệm
x^2 + 3xy + 2y^2 = 0
=> x^2 + xy + 2xy + 2y^2 = 0
=> x(x+y) + 2y ( x+ y ) = 0 =
=> ( x+ 2y)( x + y ) = 0
=> x = -2y hoặc x = -y
(+) x = -2y thay vào ta có :
8y^2 + 6y + 5 = 0 giải ra y => x
(+) thay x = -y ta có :
2y^2 - 3y + 5 = 0 tương tự
1) (x + 2016)2016 + |y - 2017|2017 = 0
\(\Leftrightarrow\hept{\begin{cases}\left(x+2016\right)^{2016}=0\\\left|y-2017\right|^{2017}=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x+2016=0\\y-2017=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=-2016\\y=2017\end{cases}}\)
a) ( x - 1 )2 + ( y + 3 )4 = 0
=> ( x - 1 )2 = 0 và ( y + 3 )4 = 0
+) ( x - 1 )2 = 0 => x - 1 = 0 => x = 1
+) ( y + 3 )4 = 0 => y + 3 = 0 => y = -3
Vậy x = 1; y = -3
b) | x + 3y - 1 | + ( 3y - 2 )2016 = 0
=> | x + 3y - 1 | = 0 và ( 3y - 2 )2016 = 0
+) ( 3y - 2 )2016 = 0
=> 3y - 2 = 0
=> 3y = 2
\(\Rightarrow y=\frac{2}{3}\)
+) | x + 3y - 1 | = 0
=> x + 3y - 1 = 0
\(\Rightarrow x+\frac{2}{3}.3-1=0\)
=> x + 2 - 1 = 0
=> x + 1 = 0
=> x = -1
Vậy \(y=\frac{2}{3};x=-1\)
Vì (x - 1)2 ≥ 0 ; ( y + 3)4 ≥ 0 với mọi x
Để (x - 1)2 + ( y + 3)4 = 0
<=> (x - 1)2 = 0 và ( y + 3)4 =0
<=> x - 1 = 0 và y + 3 = 0
=> x = 2 và y = - 3
ý b tương tự