Cho hệ phương trình
\(\hept{\begin{cases}x-3y-3=0\\x^2+y^2-2x-2y-9=0\end{cases}}\)
gọi (x1;y1) và (x2;y2) là hai nghiệm của hệ phương trình.
Giá trị biểu thức M = (x1-x2)2+(y1-y2)2 là ...
Giải hệ phương trình:
\(1.\hept{\begin{cases}x^2-2x\sqrt{y}+2y=x\\y^2-2y\sqrt{z}+2z=y\\z^2-2z\sqrt{x}+2x=z\end{cases}}\)
\(2.\hept{\begin{cases}2x^3+2z^2+3z+3=0\\2y^3+2x^2+3x+3=0\\2z^3+2y^2+3y+3=0\end{cases}}\)
\(\hept{\begin{cases}x^2-2x\sqrt{y}+2y=x\\y^2-2y\sqrt{z}+2z=y\\z^2-2z\sqrt{x}+2x=z\end{cases}}\)
\(\Leftrightarrow x^2-2x\sqrt{y}+2y+y^2-2y\sqrt{z}+2z+z^2-2z\sqrt{x}+2x=x+y+z\)
\(\Leftrightarrow\left(x-\sqrt{y}\right)^2+\left(y-\sqrt{z}\right)^2+\left(z-\sqrt{x}\right)^2=0\)
\(\Rightarrow\hept{\begin{cases}x-\sqrt{y}=0\\y-\sqrt{z}=0\\z-\sqrt{x}=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\sqrt{y}\\y=\sqrt{z}\\z=\sqrt{x}\end{cases}}}\)
\(\Rightarrow\orbr{\begin{cases}x=y=z=0\\x=y=z=1\end{cases}}\)
Giải hệ phương trình \(\hept{\begin{cases}x^2y-2x+3y^2\\x^2+y^2x+2y=0\end{cases}=0}\)
\(\hept{\begin{cases}x^2y-2x+3y^2=0\\x^2+xy^2+2y=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=y=0\\x=-y=1\\x=2\sqrt[3]{3};y=-\frac{2}{\sqrt[3]{3}}\end{cases}}\)
giải hệ phương trình \(\hept{\begin{cases}x^2+y^2-2x-2y-23=0\\x-3y-3=0\end{cases}}\)
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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
Giải hệ phương trình:
a)\(\hept{\begin{cases}2x+3y=9\\x-3=y-2\end{cases}}\)
b)\(\hept{\begin{cases}2x+3y+z=81\\x+2y-z=-2\\x-y=z-2y\end{cases}}\)
Giải hệ phương trình: \(\hept{\begin{cases}x^2y-2x+3y^2=0\\^{x^2+y^2x+2y=0}\end{cases}}\)
giải hệ phương trình bằng phương pháp thế
\(â,\hept{\begin{cases}3x^2+\left(6-y\right)x^2-2xy=0\\x^2-x+y=-3\end{cases}}\)
\(b,\hept{\begin{cases}x^2+y^2+xy+1=4y\\y\left(x+y\right)^2=2x^2+7y+2\end{cases}}\)
\(c,\hept{\begin{cases}x^4+2x^3y+x^2y^2=2x+9\\x^2+2xy=6x+6\end{cases}}\)
\(d,\hept{\begin{cases}x\sqrt{y+1}=1\\x^2y=y-1\end{cases}}\)
Dùng cái đầu đi ạ
Biểu diễn hình học tập nghiệm của các bất phương trình bậc nhất hai ẩn sau:
a,\(\hept{\begin{cases}2x-1\le0\\-3x+5\le0\end{cases}}\)
b,\(\hept{\begin{cases}3-y< 0\\2x-3y+1>0\end{cases}}\)
c,\(\hept{\begin{cases}x-2y< 0\\x+3y>-2\end{cases}}\)
d,\(\hept{\begin{cases}3x-2y-6\ge0\\2\left(x-1\right)+\frac{3y}{2}\le4\\x\ge0\end{cases}}\)
e,\(\hept{\begin{cases}x-y>0\\x-3y\le-3\\x+y>5\end{cases}}\)
f,\(\hept{\begin{cases}x-3y< 0\\x+2y>-3\\y+x< 2\end{cases}}\)
giải hệ phương trình
1)\(\hept{\begin{cases}x^2+xy+y^2=3\\x^3+2y^3=y+2x\end{cases}}\)
2) \(\hept{\begin{cases}\frac{y^2+1}{y}=\frac{x^2+1}{x}\\x^2+3y^2=4\end{cases}}\)
3)\(\hept{\begin{cases}x^2+y^4-2xy^3=0\\x^2+2y^2-2xy=1\end{cases}}\)
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............
Giải hệ phương trình:
a) \(\hept{\begin{cases}2x-y=7\\x-2y=5\end{cases}}\)
b) \(\hept{\begin{cases}2x+3y+2=0\\x-4y-10=0\end{cases}}\)
c) \(\hept{\begin{cases}3x-y=-2\\5x-2y=1\end{cases}}\)
d) \(\hept{\begin{cases}2x+3y=7\\x-2y=-7\end{cases}}\)
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: \(\Leftrightarrow\left\{{}\begin{matrix}2x+3y=7\\2x-4y=-14\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}7y=21\\x=-7+2y\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=3\\x=-1\end{matrix}\right.\)
Đồng bào thân thiện đáng yêu cứu toy với :((
Giải hệ phương trình : \(\hept{\begin{cases}\sqrt[3]{\frac{2x+1}{y+2}}+\sqrt[3]{\frac{y+2}{2x+1}}=2\\4x+3y=7\end{cases}}\)
Giải hệ phương trình : \(\hept{\begin{cases}\sqrt{x^2+2y+3}+2y-3=0_{ }\\2\left(2y^3+x^3\right)+3y\left(x+1\right)^2+6x\left(x+1\right)+2=0\end{cases}^{ }}\)
Giải hệ phương trình : \(\hept{\begin{cases}\sqrt{2x-3}=\left(y^2+2016\right)\left(5-y\right)+\sqrt{y}\\y\left(y-x+2\right)=3x+3\end{cases}}\)
Cảm ơn mọi người nhé hiuhiu <3
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>
\(1,ĐKXĐ:\hept{\begin{cases}y\ne-2\\x\ne-\frac{1}{2}\end{cases}}\)
Đặt \(\sqrt[3]{\frac{2x+1}{y+2}}=a\left(a\ne0\right)\)
\(Pt\left(1\right)\Leftrightarrow a+\frac{1}{a}=2\)
\(\Leftrightarrow a^2+1=2a\)
\(\Leftrightarrow\left(a-1\right)^2=0\)
\(\Leftrightarrow a=1\)
\(\Leftrightarrow\sqrt[3]{\frac{2x+1}{y+2}}=1\)