HT
2
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
TH
2
18 tháng 8 2017
\(\hept{\begin{cases}x^2y-2x+3y^2=0\\x^2+xy^2+2y=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=y=0\\x=-y=1\\x=2\sqrt[3]{3};y=-\frac{2}{\sqrt[3]{3}}\end{cases}}\)
BH
1 tháng 3 2020
\(\hept{\begin{cases}x^2-2x\sqrt{y}+2y=x\\y^2-2y\sqrt{z}+2z=y\\z^2-2z\sqrt{x}+2x=z\end{cases}}\)
\(\Leftrightarrow x^2-2x\sqrt{y}+2y+y^2-2y\sqrt{z}+2z+z^2-2z\sqrt{x}+2x=x+y+z\)
\(\Leftrightarrow\left(x-\sqrt{y}\right)^2+\left(y-\sqrt{z}\right)^2+\left(z-\sqrt{x}\right)^2=0\)
\(\Rightarrow\hept{\begin{cases}x-\sqrt{y}=0\\y-\sqrt{z}=0\\z-\sqrt{x}=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\sqrt{y}\\y=\sqrt{z}\\z=\sqrt{x}\end{cases}}}\)
\(\Rightarrow\orbr{\begin{cases}x=y=z=0\\x=y=z=1\end{cases}}\)
21 tháng 2 2019
Câu 1: ĐK: x khác -1/2, y khác -2
Đặt \(\sqrt[3]{\frac{2x+1}{y+2}}=t\) Từ phương trình thứ nhất ta có:
\(t+\frac{1}{t}=2\Leftrightarrow t^2-2t+1=0\Leftrightarrow t=1\)
=> \(\sqrt[3]{\frac{2x+1}{y+2}}=1\Leftrightarrow2x+1=y+2\Leftrightarrow2x-y=1\)
Vậy nên ta có hệ phương trình cơ bản: \(\hept{\begin{cases}2x-y=1\\4x+3y=7\end{cases}}\)Em làm tiếp nhé>
21 tháng 2 2019
\(1,ĐKXĐ:\hept{\begin{cases}y\ne-2\\x\ne-\frac{1}{2}\end{cases}}\)
Đặt \(\sqrt[3]{\frac{2x+1}{y+2}}=a\left(a\ne0\right)\)
\(Pt\left(1\right)\Leftrightarrow a+\frac{1}{a}=2\)
\(\Leftrightarrow a^2+1=2a\)
\(\Leftrightarrow\left(a-1\right)^2=0\)
\(\Leftrightarrow a=1\)
\(\Leftrightarrow\sqrt[3]{\frac{2x+1}{y+2}}=1\)
31 tháng 3 2018
2 \(\hept{\begin{cases}\frac{x^2+1}{y}=\frac{y^2+1}{y}\left(1\right)\\x^2+3y^2=4\left(2\right)\end{cases}}\)
ĐK \(x,y\ne0\)
Từ \(\frac{y^2+1}{y}=\frac{x^2+1}{x}\Leftrightarrow xy^2+x=x^2y+y\Leftrightarrow\left(xy-1\right)\left(x-y\right)=0\)
\(\Leftrightarrow\hept{\begin{cases}x=y\\xy=1\end{cases}}\)
+ thay \(x=y\)vào (2) ta dc ..................
+xy=1 suy ra 1=1/y thay vao 2 ta dc............
8 tháng 6 2022
a: \(\Leftrightarrow\left\{{}\begin{matrix}2x-y=7\\2x-4y=10\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}3y=-3\\2x-y=7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=-1\\x=3\end{matrix}\right.\)
b: \(\Leftrightarrow\left\{{}\begin{matrix}2x+3y=-2\\x-4y=10\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2x+3y=-2\\2x-8y=20\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}11y=-22\\x-4y=10\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=-2\\x=10+4y=10-8=2\end{matrix}\right.\)
c: \(\Leftrightarrow\left\{{}\begin{matrix}6x-2y=-4\\5x-2y=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-5\\y=3x+2=-15+2=-13\end{matrix}\right.\)
d: \(\Leftrightarrow\left\{{}\begin{matrix}2x+3y=7\\2x-4y=-14\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}7y=21\\x=-7+2y\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=3\\x=-1\end{matrix}\right.\)
DN
6 tháng 2 2018
\(\hept{\begin{cases}x-3y+\sqrt{x^2+3y^2}=0\left(1\right)\\\sqrt{2y-1}+2x^2-y^2-3x+1=0\left(2\right)\end{cases}}\) \(\left(ĐKXĐ:y\ge\frac{1}{2}\right)\)
Xét phương trình (1)
\(\sqrt{x^2+3y^2}=3y-x\)
\(\Rightarrow x^2+3y^2=x^2-6xy+9y^2\)
\(\Leftrightarrow6y^2-6xy=0\)
\(\Leftrightarrow y\left(y-x\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}y=0\left(ktmđkxđ\right)\\x=y\end{cases}}\)
Thay x=y vào (2) ta đc:
\(\sqrt{2y-1}+2y^2-y^2-3y+1=0\)
\(\Leftrightarrow\sqrt{2y-1}+y^2-3y+1=0\)
\(\Leftrightarrow\left(\sqrt{2y-1}-1\right)+\left(y^2-3y+2\right)=0\)
\(\Leftrightarrow\frac{2y-1-1}{\sqrt{2y-1}+1}+\left(y-2\right)\left(y-1\right)=0\)
\(\Leftrightarrow\left(y-1\right)\left(\frac{2}{\sqrt{2y-1}+1}+y-2\right)=0\)
\(\Rightarrow y=1\left(tmđkxđ\right)\)
Vậy nghiệm của hpt trên là (x;y)=(1;1)
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