Violympic toán 9
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giai hpt
a.\(\left\{{}\begin{matrix}x-2\left(y-1\right)=3x\\3x-2\left(y+1\right)=3\left(x-1\right)\end{matrix}\right.\)
b.\(\left\{{}\begin{matrix}3\left(x+1\right)-2y=5-y\\4x-2\left(y+1\right)=-3\end{matrix}\right.\)
1)left{{}begin{matrix}2x+dfrac{1}{y}dfrac{3}{x}2y+dfrac{1}{x}dfrac{3}{y}end{matrix}right.2)left{{}begin{matrix}x^33x+8yy^33y+8xend{matrix}right.3)left{{}begin{matrix}x^2+y^2+x-2y2x^2+y^2+2x+2y11end{matrix}right.4)left{{}begin{matrix}x^3-y13x^2-3xy+y^21end{matrix}right.5)left{{}begin{matrix}x^3-y^39left(x-yright)left(x^2+y^2right)15end{matrix}right.
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1)\(\left\{{}\begin{matrix}2x+\dfrac{1}{y}=\dfrac{3}{x}\\2y+\dfrac{1}{x}=\dfrac{3}{y}\end{matrix}\right.\)
2)\(\left\{{}\begin{matrix}x^3=3x+8y\\y^3=3y+8x\end{matrix}\right.\)
3)\(\left\{{}\begin{matrix}x^2+y^2+x-2y=2\\x^2+y^2+2x+2y=11\end{matrix}\right.\)
4)\(\left\{{}\begin{matrix}x^3-y=1\\3x^2-3xy+y^2=1\end{matrix}\right.\)
5)\(\left\{{}\begin{matrix}x^3-y^3=9\\\left(x-y\right)\left(x^2+y^2\right)=15\end{matrix}\right.\)
Giải hệ phương trình :
1, left{{}begin{matrix}x-2y12x-y4end{matrix}right.
2, left{{}begin{matrix}frac{x}{y}-frac{y}{y+12}1frac{x}{y+12}-frac{x}{y}2end{matrix}right.
3, left{{}begin{matrix}3x^2+y^25x^2-3y1end{matrix}right.
4, left{{}begin{matrix}sqrt{3x-1}-sqrt{2y+1}12sqrt{3x-1}+3sqrt{2y+1}12end{matrix}right.
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Giải hệ phương trình :
1, \(\left\{{}\begin{matrix}x-2y=1\\2x-y=4\end{matrix}\right.\)
2, \(\left\{{}\begin{matrix}\frac{x}{y}-\frac{y}{y+12}=1\\\frac{x}{y+12}-\frac{x}{y}=2\end{matrix}\right.\)
3, \(\left\{{}\begin{matrix}3x^2+y^2=5\\x^2-3y=1\end{matrix}\right.\)
4, \(\left\{{}\begin{matrix}\sqrt{3x-1}-\sqrt{2y+1}=1\\2\sqrt{3x-1}+3\sqrt{2y+1}=12\end{matrix}\right.\)
giải hệ pt sau
aleft{{}begin{matrix}4x+y28x+3y5end{matrix}right. bleft{{}begin{matrix}3x_{ }-2y114x-5y3end{matrix}right. cleft{{}begin{matrix}4x+3y135x-3y_{ }-31end{matrix}right. Dleft{{}begin{matrix}7X+5Y193x+5y31end{matrix}right.
eleft{{}begin{matrix}7x-5y33x+10y62end{matrix}right. fleft{{}begin{matrix}2x+5y113x+2y11end{matrix}right. gleft{{}begin{matrix}x+3y4y-x+52x-y3x-...
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giải hệ pt sau
a\(\left\{{}\begin{matrix}4x+y=2\\8x+3y=5\end{matrix}\right.\) b\(\left\{{}\begin{matrix}3x_{ }-2y=11\\4x-5y=3\end{matrix}\right.\) c\(\left\{{}\begin{matrix}4x+3y=13\\5x-3y=_{ }-31\end{matrix}\right.\) D\(\left\{{}\begin{matrix}7X+5Y=19\\3x+5y=31\end{matrix}\right.\)
e\(\left\{{}\begin{matrix}7x-5y=3\\3x+10y=62\end{matrix}\right.\) f\(\left\{{}\begin{matrix}2x+5y=11\\3x+2y=11\end{matrix}\right.\) g\(\left\{{}\begin{matrix}x+3y=4y-x+5\\2x-y=3x-2\left(y+1\right)\end{matrix}\right.\)
12 tháng 12 2020 lúc 7:44
Giải hệ
1) \(\left\{{}\begin{matrix}x-\dfrac{1}{x}=y-\dfrac{1}{y}\\2x^2-xy-1=0\end{matrix}\right.\)
2) \(\left\{{}\begin{matrix}y\left(4x^3+1\right)=3\\y^3\left(3x-1\right)=4\end{matrix}\right.\)
Giải phương trình bằng phương pháp thế :
1) left{{}begin{matrix}4x+y28x+3y5end{matrix}right.
2) left{{}begin{matrix}x-ym2x+y4end{matrix}right.
3)left{{}begin{matrix}3x+2y6x-y2end{matrix}right.
4) left{{}begin{matrix}2x-3y1-4x+6y2end{matrix}right.
5)left{{}begin{matrix}2x+3y55x-4y1end{matrix}right.
6)left{{}begin{matrix}3x-y7x+2y0end{matrix}right.
7)left{{}begin{matrix}x+4y23x+2y4end{matrix}right.
8)left{{}begin{matrix}-x-y2-2x-3y9end{matrix}right.
9)left{{...
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Giải phương trình bằng phương pháp thế :
1) \(\left\{{}\begin{matrix}4x+y=2\\8x+3y=5\end{matrix}\right.\)
2) \(\left\{{}\begin{matrix}x-y=m\\2x+y=4\end{matrix}\right.\)
3)\(\left\{{}\begin{matrix}3x+2y=6\\x-y=2\end{matrix}\right.\)
4) \(\left\{{}\begin{matrix}2x-3y=1\\-4x+6y=2\end{matrix}\right.\)
5)\(\left\{{}\begin{matrix}2x+3y=5\\5x-4y=1\end{matrix}\right.\)
6)\(\left\{{}\begin{matrix}3x-y=7\\x+2y=0\end{matrix}\right.\)
7)\(\left\{{}\begin{matrix}x+4y=2\\3x+2y=4\end{matrix}\right.\)
8)\(\left\{{}\begin{matrix}-x-y=2\\-2x-3y=9\end{matrix}\right.\)
9)\(\left\{{}\begin{matrix}2x-3y=2\\-4x+6y=2\end{matrix}\right.\)
giúp mình với :((
giai hpt
a.\(\left\{{}\begin{matrix}x=y+4\\2x+3=0\end{matrix}\right.\)
b.\(\left\{{}\begin{matrix}2x+y=7\\3y-x=7\end{matrix}\right.\)
c.\(\left\{{}\begin{matrix}5x+y=3\\-x-\dfrac{1}{5}y=\dfrac{-3}{5}\end{matrix}\right.\)
d.\(\left\{{}\begin{matrix}3x-5y=-18\\x-5=2y\end{matrix}\right.\)
giải hệ pt:
(1) \(\left\{{}\begin{matrix}x^2-3xy+2y^2=0\\3x+y=6\end{matrix}\right.\)
(2)\(\left\{{}\begin{matrix}\dfrac{x-1}{2x+1}-\dfrac{y-2}{y+2}=1\\\dfrac{3x-3}{2x+1}+\dfrac{2y-4}{y+2}=3\end{matrix}\right.\)
(3)\(\left\{{}\begin{matrix}2\left(x+y\right)+\sqrt{x+1}=4\\x+y-3\sqrt{x+1}=-5\end{matrix}\right.\)
giải hpt
a) \(\left\{{}\begin{matrix}x\sqrt{5}-\left(1+\sqrt{3}\right)y=1\\\left(1-\sqrt{3}\right)x+y\sqrt{5}=1\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}0,2x+0,1y=0,3\\3x+y=5\end{matrix}\right.\)
c) \(\left\{{}\begin{matrix}\left(3x+2\right)\left(2y-3\right)=6xy\\\left(4x+5\right)\left(y-5\right)=4xy\end{matrix}\right.\)