TH
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
BH
1 tháng 3 2020
\(\hept{\begin{cases}x^2-2x\sqrt{y}+2y=x\\y^2-2y\sqrt{z}+2z=y\\z^2-2z\sqrt{x}+2x=z\end{cases}}\)
\(\Leftrightarrow x^2-2x\sqrt{y}+2y+y^2-2y\sqrt{z}+2z+z^2-2z\sqrt{x}+2x=x+y+z\)
\(\Leftrightarrow\left(x-\sqrt{y}\right)^2+\left(y-\sqrt{z}\right)^2+\left(z-\sqrt{x}\right)^2=0\)
\(\Rightarrow\hept{\begin{cases}x-\sqrt{y}=0\\y-\sqrt{z}=0\\z-\sqrt{x}=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\sqrt{y}\\y=\sqrt{z}\\z=\sqrt{x}\end{cases}}}\)
\(\Rightarrow\orbr{\begin{cases}x=y=z=0\\x=y=z=1\end{cases}}\)
HT
2
10 tháng 10 2018
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10 tháng 10 2018
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
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: \(\Leftrightarrow\left\{{}\begin{matrix}2x+3y=7\\2x-4y=-14\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}7y=21\\x=-7+2y\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=3\\x=-1\end{matrix}\right.\)
9 tháng 5 2020
\(\hept{\begin{cases}2x^2+3xy-2y^2-5\left(2x-y\right)=0\left(1\right)\\x^2-2xy-3y^2+15=0\left(2\right)\end{cases}\left(I\right)}\)
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)
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)
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 \(\sqrt[3]{\frac{2x+1}{y+2}}=a\left(a\ne0\right)\)
\(Pt\left(1\right)\Leftrightarrow a+\frac{1}{a}=2\)
\(\Leftrightarrow a^2+1=2a\)
\(\Leftrightarrow\left(a-1\right)^2=0\)
\(\Leftrightarrow a=1\)
\(\Leftrightarrow\sqrt[3]{\frac{2x+1}{y+2}}=1\)
\(\hept{\begin{cases}x^2y-2x+3y^2=0\\x^2+xy^2+2y=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=y=0\\x=-y=1\\x=2\sqrt[3]{3};y=-\frac{2}{\sqrt[3]{3}}\end{cases}}\)
thiếu nghiệm