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\(\hept{\begin{cases}x^2y-2x+3y^2=0\\x^2+xy^2+2y=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=y=0\\x=-y=1\\x=2\sqrt[3]{3};y=-\frac{2}{\sqrt[3]{3}}\end{cases}}\)
\(\hept{\begin{cases}x^2-2x\sqrt{y}+2y=x\\y^2-2y\sqrt{z}+2z=y\\z^2-2z\sqrt{x}+2x=z\end{cases}}\)
\(\Leftrightarrow x^2-2x\sqrt{y}+2y+y^2-2y\sqrt{z}+2z+z^2-2z\sqrt{x}+2x=x+y+z\)
\(\Leftrightarrow\left(x-\sqrt{y}\right)^2+\left(y-\sqrt{z}\right)^2+\left(z-\sqrt{x}\right)^2=0\)
\(\Rightarrow\hept{\begin{cases}x-\sqrt{y}=0\\y-\sqrt{z}=0\\z-\sqrt{x}=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\sqrt{y}\\y=\sqrt{z}\\z=\sqrt{x}\end{cases}}}\)
\(\Rightarrow\orbr{\begin{cases}x=y=z=0\\x=y=z=1\end{cases}}\)
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: \(\Leftrightarrow\left\{{}\begin{matrix}2x+3y=7\\2x-4y=-14\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}7y=21\\x=-7+2y\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=3\\x=-1\end{matrix}\right.\)
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cho mình hỏi bạn có vấn đề gì không.
lần sau nếu bạn giải không được thì đừng bấm trả lời nha,làm vậy sẽ khiến người đăng bài thất vọng nha bạn
\(a,\hept{\begin{cases}\left(x-y\right)^2=1\\2x^2+2y^2-2xy-y=0\end{cases}}\)
Xét từng TH với x-y=1 và x-y=-1
\(b,\hept{\begin{cases}\left(x-1\right)\left(y+2\right)=0\\xy-3x+2y=0\end{cases}}\)
Xét từng TH x=1 và y=-2
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............
\(\hept{\begin{cases}2x^2+3xy-2y^2-5\left(2x-y\right)=0\left(1\right)\\x^2-2xy-3y^2+15=0\left(2\right)\end{cases}\left(I\right)}\)
Ta có \(\left(1\right)\Leftrightarrow\left(2x-y\right)\left(x+2y\right)-5\left(2x-y\right)=0\)
\(\Leftrightarrow\left(2x-y\right)\left(x+2y-5\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}y=2x\\x=5-2y\end{cases}}\)
Do đó \(\left(I\right)\Leftrightarrow\hept{\begin{cases}y=2x\\x^2-2x\cdot2x-3\left(2x\right)^2+15=0\end{cases}\left(II\right)}\)hoặc \(\hept{\begin{cases}x=5-2y\\\left(5-2y\right)^2-2\left(5-2y\right)y-3y^2+15=0\end{cases}\left(III\right)}\)
\(\left(II\right)\Leftrightarrow\hept{\begin{cases}y=2x\\-15x^2+15=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=1;y=2\\x=-1;y=-2\end{cases}}}\)
\(\left(III\right)\Leftrightarrow\hept{\begin{cases}x=5-2y\\5y^2-30y+40=0\end{cases}\Leftrightarrow\orbr{\begin{cases}y=2;x=1\\y=4;x=-3\end{cases}}}\)
Vậy hệ phương trình (I) đã cho có nghiệm (x;y)=(1;2);(-1;-2);(-3;4)