Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Theo hệ thức Viet: \(\left\{{}\begin{matrix}x_1+x_2=-\dfrac{5}{3}\\x_1x_2=-2\end{matrix}\right.\)
Ta có: \(\left\{{}\begin{matrix}y_1+y_2=2x_1-x_2+2x_2-x_1\\y_1y_2=\left(2x_1-x_2\right)\left(2x_2-x_1\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}y_1+y_2=x_1+x_2\\y_1y_2=-2x_1^2-2x_2^2+5x_1x_2\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}y_1+y_2=-\dfrac{5}{3}\\y_1y_2=-2\left(x_1+x_2\right)^2+9x_1x_2\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}y_1+y_2=-\dfrac{5}{3}\\y_1y_2=-2.\left(-\dfrac{5}{3}\right)^2+9.\left(-2\right)=-\dfrac{212}{9}\end{matrix}\right.\)
\(\Rightarrow y_1;y_2\) là nghiệm của:
\(y^2+\dfrac{5}{3}y-\dfrac{212}{9}=0\Leftrightarrow9y^2+10y-212=0\)
\(\hept{\begin{cases}x^2y-2x+3y^2=0\\x^2+xy^2+2y=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=y=0\\x=-y=1\\x=2\sqrt[3]{3};y=-\frac{2}{\sqrt[3]{3}}\end{cases}}\)
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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
\(\hept{\begin{cases}x^2-2x\sqrt{y}+2y=x\\y^2-2y\sqrt{z}+2z=y\\z^2-2z\sqrt{x}+2x=z\end{cases}}\)
\(\Leftrightarrow x^2-2x\sqrt{y}+2y+y^2-2y\sqrt{z}+2z+z^2-2z\sqrt{x}+2x=x+y+z\)
\(\Leftrightarrow\left(x-\sqrt{y}\right)^2+\left(y-\sqrt{z}\right)^2+\left(z-\sqrt{x}\right)^2=0\)
\(\Rightarrow\hept{\begin{cases}x-\sqrt{y}=0\\y-\sqrt{z}=0\\z-\sqrt{x}=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\sqrt{y}\\y=\sqrt{z}\\z=\sqrt{x}\end{cases}}}\)
\(\Rightarrow\orbr{\begin{cases}x=y=z=0\\x=y=z=1\end{cases}}\)
\(\hept{\begin{cases}x+y=4\left(1\right)\\2x+3y=m\left(2\right)\end{cases}}\)
từ \(\left(1\right)\)ta có: \(x=4-y\)\(\left(3\right)\)
thay \(\left(3\right)\) vào \(\left(2\right)\)ta được
\(2.\left(4-y\right)+3y=m\)
\(8-2y+3y=m\)
\(8+y=m\)
\(y=m-8\) \(\left(4\right)\)
hệ phương trình có nghiệm duy nhất khi pt \(\left(4\right)\) có nghiệm duy nhất
ta thấy pt (4) luôn có nghiệm duy nhất với \(\forall y\in R\)
vậy \(\forall y\in R\)thì hệ pt đã cho có nghiệm \(\left(x;y\right)=\left(4-y;m-8\right)\)
theo bài ra \(\hept{\begin{cases}x>0\\y< 0\end{cases}}\)\(\Leftrightarrow\hept{\begin{cases}4-y>0\\m-8< 0\end{cases}}\Leftrightarrow\hept{\begin{cases}y>4\\m< 8\end{cases}}\)
vậy \(m< 8\) là tập hợp các giá trị cần tìm
Ta có :
\(\hept{\begin{cases}x+y=4\\2x+3y=m\end{cases}}\Leftrightarrow\hept{\begin{cases}x+y=4\\x+x+y+y+y=m\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x+y=4\\4+4+y=m\end{cases}\Leftrightarrow\hept{\begin{cases}y=4-x\\8+4-x=m\end{cases}}}\)
\(\Leftrightarrow\hept{\begin{cases}y=4-12+m\\x=12-m\end{cases}}\Leftrightarrow\hept{\begin{cases}y=m-8\\x=12-m\end{cases}}\)
\(\Leftrightarrow\)\(x+y=m-8+12-m=4\)
\(\Leftrightarrow\hept{\begin{cases}y=4-8\\x=12-4\end{cases}\Leftrightarrow\hept{\begin{cases}y=-4\\x=8\end{cases}}}\)
Thoả mãn \(x>0;y< 0\)
Vậy \(x=8\) và \(y=-4\)
Từ pt 1, rút x=3y+3 ra rồi thay vào pt dưới
giải pt bậc 2 là ra nghiệm, từ đó thay vào tính M
????????
cho hệ phương trình
các anh các chị nói gì nhợ
thêm lãi ý hả
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