Violympic toán 9
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BL
8 tháng 12 2019 lúc 16:44
Giải hpt : a) left{{}begin{matrix}left(x^2+y^2right)left(x+y+1right)25left(y+1right)x^2+xy+2y^2+x-8y9end{matrix}right. b) left{{}begin{matrix}x^2+y^2+6xy-frac{1}{left(x-yright)^2}+frac{9}{8}02y-frac{1}{x-y}+frac{5}{4}0end{matrix}right.
c) left{{}begin{matrix}frac{x}{x^2-y}+frac{5y}{x+y^2}45x+y+frac{x^2-5y^2}{xy}5end{matrix}right. d) left{{}begin{matrix}3xy+y+121x9x^2y^2+3xy+1117x^2end{matrix}right.
e) left{{}begin{matrix}xleft(x^2-y^2right)+x^21sqrt{left(x-y^2right)^3}7...
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Giải hpt : a) \(\left\{{}\begin{matrix}\left(x^2+y^2\right)\left(x+y+1\right)=25\left(y+1\right)\\x^2+xy+2y^2+x-8y=9\end{matrix}\right.\) b) \(\left\{{}\begin{matrix}x^2+y^2+6xy-\frac{1}{\left(x-y\right)^2}+\frac{9}{8}=0\\2y-\frac{1}{x-y}+\frac{5}{4}=0\end{matrix}\right.\)
c) \(\left\{{}\begin{matrix}\frac{x}{x^2-y}+\frac{5y}{x+y^2}=4\\5x+y+\frac{x^2-5y^2}{xy}=5\end{matrix}\right.\) d) \(\left\{{}\begin{matrix}3xy+y+1=21x\\9x^2y^2+3xy+1=117x^2\end{matrix}\right.\)
e) \(\left\{{}\begin{matrix}x\left(x^2-y^2\right)+x^2=1\sqrt{\left(x-y^2\right)^3}\\76x^2-20y^2+2=\sqrt[3]{4x\left(8x+1\right)}\end{matrix}\right.\)
giải hệ phương trình
a)\(\left\{{}\begin{matrix}\left(x^2+1\right)\left(y^2+1\right)=10\\\left(x+y\right)\left(xy-1\right)=3\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}x^2+y^2+2\left(xy-2\right)=0\\x^2+y^2-2xy=16\end{matrix}\right.\)
c)\(\left\{{}\begin{matrix}x^2-2x\sqrt{y}+2y=x\\y^2-2y\sqrt{x}+2z=y\\z^2-2z\sqrt{x}+2x=z\end{matrix}\right.\)
Giải hệ phương trình:
1. left{{}begin{matrix}x+32sqrt{left(3y-xright)left(y+1right)}sqrt{3y-2}-sqrt{dfrac{x+5}{2}}xy-2y-2end{matrix}right.
2. left{{}begin{matrix}sqrt{2y^2-7y+10-xleft(y+3right)}+sqrt{y+1}x+1sqrt{y+1}+dfrac{3}{x+1}x+2yend{matrix}right.
3. left{{}begin{matrix}sqrt{4x-y}-sqrt{3y-4x}12sqrt{3y-4x}+yleft(5x-yright)xleft(4x+yright)-1end{matrix}right.
4. left{{}begin{matrix}9sqrt{dfrac{41}{2}left(x^2+dfrac{1}{2x+y}right)}3+40xx^2+5xy+6y4y^2+9x+9end{matrix}right.
5. left{{}begin{mat...
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Giải hệ phương trình:
1. \(\left\{{}\begin{matrix}x+3=2\sqrt{\left(3y-x\right)\left(y+1\right)}\\\sqrt{3y-2}-\sqrt{\dfrac{x+5}{2}}=xy-2y-2\end{matrix}\right.\)
2. \(\left\{{}\begin{matrix}\sqrt{2y^2-7y+10-x\left(y+3\right)}+\sqrt{y+1}=x+1\\\sqrt{y+1}+\dfrac{3}{x+1}=x+2y\end{matrix}\right.\)
3. \(\left\{{}\begin{matrix}\sqrt{4x-y}-\sqrt{3y-4x}=1\\2\sqrt{3y-4x}+y\left(5x-y\right)=x\left(4x+y\right)-1\end{matrix}\right.\)
4. \(\left\{{}\begin{matrix}9\sqrt{\dfrac{41}{2}\left(x^2+\dfrac{1}{2x+y}\right)}=3+40x\\x^2+5xy+6y=4y^2+9x+9\end{matrix}\right.\)
5. \(\left\{{}\begin{matrix}\sqrt{xy+\left(x-y\right)\left(\sqrt{xy}-2\right)}+\sqrt{x}=y+\sqrt{y}\\\left(x+1\right)\left[y+\sqrt{xy}+x\left(1-x\right)\right]=4\end{matrix}\right.\)
6. \(\left\{{}\begin{matrix}x^4-x^3+3x^2-4y-1=0\\\sqrt{\dfrac{x^2+4y^2}{2}}+\sqrt{\dfrac{x^2+2xy+4y^2}{3}}=x+2y\end{matrix}\right.\)
7. \(\left\{{}\begin{matrix}x^3-12z^2+48z-64=0\\y^3-12x^2+48x-64=0\\z^3-12y^2+48y-64=0\end{matrix}\right.\)
giải HPT
a) \(\left\{{}\begin{matrix}\left(x+3\right)\left(y-5\right)=xy\\\left(2x-y\right)\left(y+15\right)=2xy\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}\sqrt{4x}-3y+4z^2=-2\\\sqrt{3x}+2y-3z^2=1\\-3\sqrt{x}+y+2z^2=4\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x^3y\left(1+y\right)+x^2y^2\left(2+y\right)+xy^3=30\\x^2y+x\left(1+y+y^2\right)+y=11\end{matrix}\right.\)
BL
29 tháng 11 2019 lúc 23:20
1. Giải hpt : a) \(\left\{{}\begin{matrix}\sqrt{x}+\sqrt{y}+\sqrt{z}=\sqrt{2017}\\\sqrt[3]{\left(x+3\right)\left(y+3\right)\left(z+3\right)}=3+\sqrt[3]{xyz}\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}\sqrt{x+1}+\sqrt[4]{x-1}+\sqrt{y^4+2}=y\\x^2+2x\left(y-1\right)+y^2-6y+1=0\end{matrix}\right.\)
Hóng cao nhân I
1. Giải hệ phương trình \(\left\{{}\begin{matrix}3\sqrt{x+2y}=4-x-2y\\\sqrt[3]{2x+6}+\sqrt{2y}=2\end{matrix}\right.\)
2. Cho 3 số thực dương x, y, z. Tìm giá trị lớn nhất của biểu thức
\(S=\frac{xyz\left(x+y+z+\sqrt{x^2+y^2+z^2}\right)}{\left(x^2+y^2+z^2\right)\left(xy+yz+zx\right)}\)
Giải PT và HPT:
1)left{{}begin{matrix}xy+x+y3frac{1}{x^2+2x}+frac{1}{y^2+2y}frac{2}{3}end{matrix}right.
2)left(sqrt{x+4}-2right)left(sqrt{4-x}+2right)2x
3)left{{}begin{matrix}xyleft(x+yright)29xyleft(3x-yright)+626x^3-2y^3end{matrix}right.
4)left{{}begin{matrix}x^2-2xy+x-2y+30y^2-x^2+2xy+2x-20end{matrix}right.
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Giải PT và HPT:
1)\(\left\{{}\begin{matrix}xy+x+y=3\\\frac{1}{x^2+2x}+\frac{1}{y^2+2y}=\frac{2}{3}\end{matrix}\right.\)
2)\(\left(\sqrt{x+4}-2\right)\left(\sqrt{4-x}+2\right)=2x\)
3)\(\left\{{}\begin{matrix}xy\left(x+y\right)=2\\9xy\left(3x-y\right)+6=26x^3-2y^3\end{matrix}\right.\)
4)\(\left\{{}\begin{matrix}x^2-2xy+x-2y+3=0\\y^2-x^2+2xy+2x-2=0\end{matrix}\right.\)
giải hệ phương trình
a,left{{}begin{matrix}left(x+sqrt{x^2+1}right)left(y+sqrt{y^2+1}right)1y+frac{y}{sqrt{x^2-1}}frac{35}{12}end{matrix}right.
b,left{{}begin{matrix}left(x^2+y^2right)left(x+y+1right)25left(y+1right)x^2+xy+2y^2+x-8y9end{matrix}right.
c,left{{}begin{matrix}2x^2+3xy-2y^2-5left(2x-yright)0x^2-2xy-3y^2+150end{matrix}right.
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giải hệ phương trình
\(a,\left\{{}\begin{matrix}\left(x+\sqrt{x^2+1}\right)\left(y+\sqrt{y^2+1}\right)=1\\y+\frac{y}{\sqrt{x^2-1}}=\frac{35}{12}\end{matrix}\right.\)
\(b,\left\{{}\begin{matrix}\left(x^2+y^2\right)\left(x+y+1\right)=25\left(y+1\right)\\x^2+xy+2y^2+x-8y=9\end{matrix}\right.\)
\(c,\left\{{}\begin{matrix}2x^2+3xy-2y^2-5\left(2x-y\right)=0\\x^2-2xy-3y^2+15=0\end{matrix}\right.\)
Giải hệ phương trình sau : \(\left\{{}\begin{matrix}\sqrt{2x+1}+\sqrt{2y+1}=\dfrac{\left(x-y\right)^2}{2}\\\left(3x+2y\right)\left(y+1\right)=4-x^2\end{matrix}\right.\)
Cho 3 số dương x;y;z thỏa mãn x+y+z=6. CMR: \(x^2+y^2+z^2-xy-yz-xz+xyz\ge8\)