Tìm x,y bt: \(\left(x-13+y\right)^2+\left(x-6-y\right)^2=0.\)
HELP ME!
Tìm x,y bt: \(\left(x-13+y\right)^2+\left(x-6-y\right)^2=0.\)
HELP ME!
(x - 13 + y)2 + (x - 6 - y)2 ≥ 0 + 0 = 0
Vì dấu "=" xảy ra nên x - 13 + y = 0 và x - 6 - y = 0
x + y = 13 và x - y = 6
x = (13 - 6) : 2 = 3,5
y = 13 - 3,5 = 9,5
Vậy x = 3,5 và y = 9,5
(\(x\) - 13 + y)2 + (\(x\) - 6 - y)2 = 0
(\(x\) - 13 + y)2 ≥ 0 ∀ \(x;y\)
(\(x-6-y\))2 ≥ 0 ∀ \(x;y\)
⇒(\(x-13+y\))2 + (\(x\) - 6- y)2 = 0
⇔ \(\left\{{}\begin{matrix}x-13+y=0\\x-6-y=0\end{matrix}\right.\)
⇒ \(\left\{{}\begin{matrix}x-6-y=0\\x-13+y+x-6-y=0\end{matrix}\right.\)
⇒ \(\left\{{}\begin{matrix}y=x-6\\2x=19\end{matrix}\right.\)
⇒ \(\left\{{}\begin{matrix}x=\dfrac{19}{2}\\y=\dfrac{19}{2}-6\end{matrix}\right.\)
⇒ \(\left\{{}\begin{matrix}x=\dfrac{19}{2}\\y=\dfrac{7}{2}\end{matrix}\right.\)
𝓥𝓲̀ \(\left(x-13+y\right)^2\ge0;\left(x-6-y\right)^2\ge0\)
\(\Rightarrow\left(x-13+y\right)^2+\left(x-6-y\right)^2\ge0\)
𝓓𝓪̂́𝓾 𝓫𝓪̆̀𝓷𝓰 𝔁𝓪̉𝔂 𝓻𝓪 𝓴𝓱𝓲 \(\left(x-13+y\right)^2=0;\left(x-6-y\right)^2=0\)
\(\Rightarrow\left(x-13+y\right)^2=0\) \(\Rightarrow\left(x-6-y\right)^2=0\)
\(x-13+y=0\) \(x-6-y=0\)
\(x+y=13\) \(x-y=6\)
\(\Rightarrow\)𝔁 𝓵𝓪̀ 1 𝓼𝓸̂́ 𝓵𝓸̛́𝓷 𝓱𝓸̛𝓷 𝔂 𝓫𝓸̛̉𝓲 𝓿𝓲̀ 𝓴𝓱𝓲 𝔁-𝔂 𝓴𝓮̂́𝓽 𝓺𝓾𝓪̉ 𝓵𝓪̀ 1 𝓼𝓸̂́ 𝓷𝓰𝓾𝔂𝓮̂𝓷 𝓭𝓾̛𝓸̛𝓷𝓰
\(\Rightarrow x=\left(13+6\right)\div2=9,5\)
\(\Rightarrow y=13-9,5=3,5\)
𝓥𝓪̣̂𝔂 𝔁=9,5 𝓿𝓪̀ 𝔂=3,5
\(\left\{{}\begin{matrix}\left(x+y\right)^2-\left(y^2-x\right)^3=6\left(x^2-x\right)-\left(y^2-y\right)\\8x^4+8y^4+8x^2+8y^2=9-16xy\left(x+y\right)\end{matrix}\right.\)
Help me giải hpt này với ạ
Mog giúp đỡ :
Tìm x ; y ; z thỏa mãn :
\(\left(3x-2y\right)^2+\left(3y-4z\right)^4+\left|x^2+y^2+z^2-1\right|=0\)
HELP ME !!!!
\(\hept{\begin{cases}\left|x^2+y^2+z^2-1\right|=0\\\left(3y-4z\right)^4\ge0\\\left(3x-2y\right)^2\ge0\end{cases}}\Rightarrow\left|x^2+y^2+z^2-1\right|+\left(3y-4z\right)^4+\left(3x-2y\right)^2\ge0\)
dấu = xảy ra khi \(\hept{\begin{cases}\left|x^2+y^2+z^2-1\right|=0\\\left(3y-4z\right)^4=0\\\left(3x-2y\right)^2=0\end{cases}}\Rightarrow\hept{\begin{cases}x^2+y^2+z^2=1\\3y=4z\\3x-2y=0\end{cases}}\Rightarrow\hept{\begin{cases}x^2+y^2+z^2=1\\y=\frac{4z}{3}\\x=\frac{2y}{3}\end{cases}}\)
Vậy ...
p/s bài này chắc chỉ có dạng chung thôi bn :)
Tìm x,y biết:
a) \(x^2+\left(y-\frac{1}{10}\right)^4=0\)
b) \(\left(\frac{1}{2}x-5\right)^{20}+\left(y^2-\frac{1}{4}\right)^{10}=0\)
Nhanh lên ai giúp mk zới!! CTV ơi, help me!!!!
a/ Ta luôn có : \(\begin{cases}x^2\ge0\\\left(y-\frac{1}{10}\right)^4\ge0\end{cases}\)\(\Rightarrow x^2+\left(y-\frac{1}{10}\right)^4\ge0\)
Để dấu "=" xảy ra thì x = 0 , y = 1/10
b/ Tương tự.
a) \(\left\{{}\begin{matrix}x^2+\left(3y+1\right)x+2y^2+y=0\\x^2+y^2+x+y=1\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}xy-x+y=3\\x^2+y^2-x+y+3xy=12\end{matrix}\right.\)
help me
Cho biểu thức:
\(H=\frac{x^2y^2}{\left(x+1\right)\left(y-1\right)}-\frac{x^2}{\left(x+y\right)\left(y-1\right)}-\frac{y^2}{\left(x+y\right)\left(x+1\right)}\)
a)Rút gọn H
b)Tìm các cặp số nguyên (x;y) sao cho giá trị của H=6
Help me plz =((
quy đồng H lên rồi rút gọn
sau ko rút gọn xong thì tìm x nguyên khi H=6
Tìm x, y,z biết:
a) \(\frac{x}{y+z+1}=\frac{y}{x+z+2}=\frac{y}{x+y-3}\)
b) \(6\left(x-\frac{1}{y}\right)=3\left(y-\frac{1}{2}\right)=2\left(z-\frac{1}{x}\right)=xyz-\frac{1}{xyz}\)
Help me ! mik hứa sẽ tk
Help me !!!
1. Rút gọn
a) \(2\left(x+y\right)\sqrt{\frac{1}{x^2+2xy+y^2}}\left(x+y>0\right)\)
b) \(\frac{3x}{7y}\sqrt{\frac{49y^2}{9x^2}}\left(x>0,y< 0\right)\)
a)
\(2\left(x+y\right)\sqrt{\frac{1}{x^2+2xy+y^2}}\left(x+y>0\right)\)
\(=2\left(x+y\right)\sqrt{\frac{1}{\left(x+y\right)^2}}\)
\(=2\left(x+y\right).\frac{1}{x+y}\)
\(=2\)
Tìm x,y biết:
a) \(\left(x-5\right)^8-2|y^2-4|=0\)
b) \(x-5+|x-3|=4\)
c) \(\sqrt{\left(x+7\right)^2}+\left(x^2-49\right)^{2012}=0\)
d) \(2|3-x|^{2017}+\left(y-x+1\right)^{2016}\le0\)
Help me!!!
#Tiểu_Tỷ_Tỷ⁀ᶜᵘᵗᵉ
Đợi đến 9 giờ nha !
Bài giải
b, \(x-5+\left|x-3\right|=4\)
\(\left|x-3\right|=4-x+5\)
\(\Rightarrow\orbr{\begin{cases}x-3=-4+x-5\\x-3=4-x+5\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x-x=-4-5+3\\x+x=4+5+3\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x\ne-6\text{ ( loại ) }\\2x=12\end{cases}}\)\(\Rightarrow\text{ }x=6\)
c, \(\sqrt{\left(x+7\right)^2}+\left(x^2-49\right)^{2012}=0\)
\(\left(x+7\right)+\left(x^2-49\right)^{2012}=0\)
\(\Rightarrow\hept{\begin{cases}x+7=0\\\left(x^2-49\right)^{2012}=0\end{cases}}\)\(\Rightarrow\hept{\begin{cases}x=-7\\x^2-49=0\end{cases}}\)\(\Rightarrow\hept{\begin{cases}x=-7\\x^2=49\end{cases}}\)\(\Rightarrow\hept{\begin{cases}x=-7\\x=\pm7\end{cases}}\)
\(\)\(\Rightarrow\text{ }x=-7\)
d, \(2\left|3-x\right|^{2017}+\left(y-x+1\right)^{2016}\le0\)
\(\text{Vì }\hept{\begin{cases}2\left|3-x\right|^{2017}\ge0\\\left(y-x+1\right)^{2016}\ge0\end{cases}}\) \(\Rightarrow\text{ Chỉ xảy ra trường hợp }2\left|3-x\right|^{2017}+\left(y-x+1\right)^{2016}=0\)
\(\Rightarrow\hept{\begin{cases}2\left|3-x\right|^{2017}=0\\\left(y-x+1\right)^{2016}=0\end{cases}}\)\(\Rightarrow\hept{\begin{cases}\left|3-x\right|^{2017}=0\\y-x+1=0\end{cases}}\)\(\Rightarrow\hept{\begin{cases}3-x=0\\y-x+1=0\end{cases}}\)\(\Rightarrow\hept{\begin{cases}x=3\\y-3+1=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=3\\y-2=0\end{cases}}\)\(\Rightarrow\hept{\begin{cases}x=3\\y=2\end{cases}}\)