\(\left\{{}\begin{matrix}-5x+y=3\\2x-3y=-5\end{matrix}\right.\)
\(\left\{{}\begin{matrix}-15x+3y=9\\2x-3y=-5\end{matrix}\right.\)
\(\left\{{}\begin{matrix}-13x=4\\2x-3y=-5\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x=\dfrac{-4}{13}\\y=\dfrac{19}{13}\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\dfrac{2x-2y}{5}+\dfrac{5x-3y}{3}=x+1\\\dfrac{2x-3y}{3}+\dfrac{4x-3y}{2}=y+1\end{matrix}\right.\)
giải hệ phương trình
\(\hept{\begin{cases}\frac{3x-2y}{5}+\frac{5x-3y}{3}=x+1\\\frac{2x-3y}{3}+\frac{4x-3y}{2}=y+1\end{cases}}\)
giải hệ phương trình: \(\hept{\begin{cases}\left(2x+4y-1\right)\sqrt{2x-y-1}=\left(4x-2y-3\right)\sqrt{x+2y}\\x^2+8x+5-2\left(3y+2\right)\sqrt{4x-3y}=2\sqrt{2x^2+5x+2}\end{cases}}\)
Rút gọn: M = \(\frac{5x^5+4x^4+3x^3+2}{4x^4+3x^3+2x^2+z}+\frac{4y^4+3y^3+2y^2+y}{5y^5+4y^4+3y^3+2}+\frac{5y^5+4z^4+3z^3+2}{4z^4+3z^3+2z^2+z}\)
Chứng minh các đường sau đồng qui:
a) (d1):x+3y=1; (d2):2x-y=-5; (d3):-3x+2y=8.
b) (d1):3x+2y=13; (d2):2x+3y=7; (d3):x-y=6; (d4):5x-0y=25.
Giải hệ phương trình: a) \(\hept{\begin{cases}x^3-3x^2+6x-4=y^3+3y\\\sqrt{x-3}+\sqrt{y+1}=3\end{cases}}\)
b) \(\hept{\begin{cases}\left(2x+2\right)\sqrt{2x-1}=y^3+3y\\y^2-xy+5=5x-6y\end{cases}}\)
1) 8y^2-25=3xy+5x
2)xy-2y-3=3x-x^2
3)x^2+2y^2-3xy_4x-3y-26=0
4)x^2+3y^2+2xy-2x-4y-3=0
5)x^3+3x=y^3
6)x^4-2x^2y+7y^2=55
7)x^2y^2-2xy=x^2+16y^2
giải hpt sau
a) {-2x+y=5x+3y=1
1)x^3 -2x-1
2) x^3 +3x^2 -4
3) x^3y^3 +x^2y^2 +4
4) x^3 + 5x^2 -9xy^2, +5y^3
5) x^4 + x^3 + 6x^2 + 5x + 5
\(\hept{\begin{cases}2x^3-y^2+\sqrt[3]{2x^3-3y+1}-\sqrt[3]{y^2+1}=3y\\x^5+x^3y^2+2y^4-yx^4-x^2y^3-y^5-2013\left(x+y\right)=0\end{cases}}\)
