\(\left(x^2-2.3.x+9\right)+\left(y^2+2.5.y+25\right)=58\)

\(\Leftrightarrow\left(x-3\right)^2+\left(y+5\right)^2=58\)

vì \(\hept{\begin{cases}\left(x-3\right)^2\ge0\\\left(y+5\right)^2\ge0\end{cases}\text{và là hai số chính phương}}\)

mà 58 chẵn => \(\hept{\begin{cases}\left(x-3\right)^2\\\left(y+5\right)^2\end{cases}\text{cùng tính chẵn lẻ}}\)

tự c/m nha, bn xét SCP chẵn, lẻ là đc(ko c/m đc ib)

\(\text{mà chỉ có 49, 9 t/m điều kiện }\Rightarrow...\)

Có: \(6x^2y^3+3x^2-10y^3=-2\)

<=> \(3x^2\left(2y^3+1\right)-5\left(2y^3+1\right)+5=-2\)

<=> \(\left(2y^3+1\right)\left(3x^2-5\right)=-7\)

Th1: \(\hept{\begin{cases}2y^3+1=-7\\3x^2-5=1\end{cases}\Leftrightarrow}\hept{\begin{cases}y^3=-4\\x^2=2\end{cases}\left(loai\right)}\)

Th2: \(\hept{\begin{cases}2y^3+1=-1\\3x^2-5=7\end{cases}\Leftrightarrow}\hept{\begin{cases}y^3=-1\\x^2=4\end{cases}\Leftrightarrow}\hept{\begin{cases}y=-1\\x=\pm2\end{cases}}\)

Th3: \(\hept{\begin{cases}2y^3+1=1\\3x^2-5=-7\end{cases}\Leftrightarrow}\hept{\begin{cases}y^3=0\\x^2=-\frac{2}{3}\end{cases}\left(loai\right)}\)

Th4: \(\hept{\begin{cases}2y^3+1=7\\3x^2-5=-1\end{cases}\Leftrightarrow}\hept{\begin{cases}y^3=3\\x^2=\frac{4}{3}\end{cases}\left(loai\right)}\)

Vậy phương trình có nghiệm: ( -2;-1) và ( 2; -1)

\(\Leftrightarrow x^4-4x^3+12x^2-32x+32=\left(y-5\right)^2\)

\(\Leftrightarrow\left(x-2\right)^2\left(x^2+8\right)=\left(y-5\right)^2\)

- Với \(x=2\Rightarrow y=5\)

- Với \(x\ne2\Rightarrow x-2\) là ước của \(y-5\) 

Đặt \(y-5=n\left(x-2\right)\)

\(\Rightarrow\left(x-2\right)^2\left(x^2+8\right)=n^2\left(x-2\right)^2\)

\(\Rightarrow x^2+8=n^2\)

\(\Rightarrow\left(n-x\right)\left(n+x\right)=8\)

\(\Rightarrow\left[{}\begin{matrix}x=1;n=-3\Rightarrow y=8\\x=-1;n=-3\Rightarrow y=14\\x=1;n=3\Rightarrow y=2\\x=-1;n=3\Rightarrow y=-4\end{matrix}\right.\) 

\(6x^2y^4+3x^2-10y^3=-2\)

\(\Leftrightarrow3x^2\left(2y^3+1\right)-10y^3-5+5=-2\)

\(\Leftrightarrow3x^2\left(2y^3+1\right)-5\left(2y^3+1\right)=-7\)

\(\Leftrightarrow\left(3x^2-5\right)\left(2y^3+1\right)=-7\)

\(\Rightarrow\left(3x^2-5\right);\left(2y^3+1\right)\in\left\{-1;1;-7;7\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(\pm\dfrac{2}{\sqrt[]{3}};\sqrt[3]{3}\right);\left(\pm\sqrt[]{2};\sqrt[3]{4}\right);\left(\varnothing;0\right);\left(\pm2;-1\right)\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(\pm2;-1\right)\right\}\left(x;y\in Z\right)\)

6x²y³ +3x² - 10y³ = -2

\(_{_{ }^{ }\Leftrightarrow}\) 2y³(3x^2 \(-\) 2) + 3x² \(-\) 2= -4

\(_{_{ }^{ }\Leftrightarrow}\)\(\left(3x^2-2\right)\left(2y^3+1\right)=-4=-1.4=-2.2\)

Vì x² \(\ge\)0 nên 3x² -2 ​​\(\ge\)-2​​

Ta có các trường hợp:

TH1: \(\left\{{}\begin{matrix}3x^2-2=-1\\2y^3+1=4\end{matrix}\right.\)\(\Leftrightarrow\)\(\left\{{}\begin{matrix}x=\pm\dfrac{1}{\sqrt{3}}\\y=\sqrt[3]{\dfrac{3}{2}}\end{matrix}\right.\)

TH2: ​\(\left\{{}\begin{matrix}3x^2-2=2\\2y^3+1=-2\end{matrix}\right.\)\(\Leftrightarrow\)\(\left\{{}\begin{matrix}x=\pm\dfrac{2}{\sqrt{3}}\\y=\sqrt[3]{\dfrac{-3}{2}}\end{matrix}\right.\)

TH3: \(\left\{{}\begin{matrix}3x^2-2=-2\\2y^3+1=2\end{matrix}\right.\)\(\Leftrightarrow\)\(\left\{{}\begin{matrix}x=0\\y=\sqrt[3]{\dfrac{1}{2}}\end{matrix}\right.\)

Vậy .....

​

x^4 + 4x^3+ 6x^2+ 4x = y^2

Hướng dẫn: Ta có: x^4 + 4x^3+ 6x^2+ 4x = y^2 

⇔ x^4 +4x^3+6x^2+4x +1- y^2=1

⇔ (x+1)^4 – y^2 = 1

⇔ [(x+1)^2 –y] [(x+1)^2+y]= 1

\(\Leftrightarrow\) \(\hept{\begin{cases}\left(x+1\right)^2-y=1\\\left(x+1\right)^2+y=1\end{cases}}\) hoặc \(\hept{\begin{cases}\left(x+1\right)^2-y=-1\\\left(x+1\right)^2+y=-1\end{cases}}\)

\(\orbr{\begin{cases}1-y=1+y\\-1-y=-1+y\end{cases}}\)

⇒ y = 0 ⇒ (x+1)^2 = 1

⇔ x+1 = ±1 ⇒ x = 0 hoặc x = -2

Vậy ( x, y ) = ( 0, 0 ); ( – 2, 0 )

Chúc bạn hk tốt!!!

 

Câu hỏi của cherry moon - Toán lớp 9 - Học toán với OnlineMath