mình không ghi lại đề nhé với lại bạn xem câu 1 chỗ -2x + 5 hay 5x ạ ?\(1.\left\{{}\begin{matrix}-6x+15y=15\\6x-8y=9\end{matrix}\right. }< =>\left\{{}\begin{matrix}7y=24\\6x-8y=9\end{matrix}\right.< =>\left\{{}\begin{matrix}y=\dfrac{24}{7}\\6x-8\left(\dfrac{24}{7}\right)=9\end{matrix}\right.< =>\left\{{}\begin{matrix}y=\dfrac{24}{7}\\x=\dfrac{85}{14}\end{matrix}\right.\)
Giải hệ phương trình
a, \(\left\{{}\begin{matrix}-2x+3y=-11\\-4x+6y=5\end{matrix}\right.\)
b, \(\left\{{}\begin{matrix}x-5y=-4\\-2x+9y=5\end{matrix}\right.\)
c, \(\left\{{}\begin{matrix}-x+3y=2\\2x-5y=1\end{matrix}\right.\)
d, \(\left\{{}\begin{matrix}-2x-y=-3\\3x+2y=6\end{matrix}\right.\)
các bạn ơi giải giúp mình với
giải hệ
a) \(\left\{{}\begin{matrix}x^2+y^2=2xy+1\\x^3-y^3=2xy+3\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}x^2+\frac{4}{y^2}=4\\x-\frac{2}{y}-\frac{4x}{y}=-2\end{matrix}\right.\)
c) \(\left\{{}\begin{matrix}2y^2-x^2=1\\2x^3-y^3=2y-x\end{matrix}\right.\)
d) \(\left\{{}\begin{matrix}x^2+6y=6x\\y^2+9=2xy\end{matrix}\right.\)
Giải các hệ Pt sau:
a,\(\left\{{}\begin{matrix}-0,5x+1,2y=2,7\\x-4,5y=-7,5\end{matrix}\right.\)
b,\(\left\{{}\begin{matrix}5x+3y=19\\2x+9y=31\end{matrix}\right.\)
c,\(\left\{{}\begin{matrix}\frac{3}{4}x+\frac{2}{5}y=2,3\\x-\frac{3}{5}y=0,8\end{matrix}\right.\)
d,\(\left\{{}\begin{matrix}5\left(x+2y\right)-3\left(x-y\right)=99\\x-3y=7x-4y-17\end{matrix}\right.\)
Giải các hệ phương trình :
a) \(\left\{{}\begin{matrix}\left(x+3\right)\left(y+5\right)=\left(x+1\right)\left(y+8\right)\\\left(2x-3\right)\left(5y+7\right)=2\left(5x-6\right)\left(y+1\right)\end{matrix}\right.\);
b) \(\left\{{}\begin{matrix}\dfrac{2x-3}{2y-5}=\dfrac{3x+1}{3y-4}\\2\left(x-3\right)-3\left(y+2\right)=-16\end{matrix}\right.\).
giải hệ sau bằng phương pháp thế
a)\(\left\{{}\begin{matrix}2x-y=4\\x+5y=3\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}-2x+3y=-1\\x+2y=3\end{matrix}\right.\)
giải hệ sau:
a)\(\left\{{}\begin{matrix}x+y=-1\\2x+y=1\end{matrix}\right.\)
b)\(\left\{{}\begin{matrix}\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{1}{5}\\\dfrac{3}{x}+\dfrac{4}{y}=2\end{matrix}\right.\)
c)\(\left\{{}\begin{matrix}2\dfrac{5}{x-1}+\dfrac{3}{3y-2}=1\\\dfrac{2}{2x-1}+\dfrac{1}{3y-2}=1\end{matrix}\right.\)
Giải hệ phương trình
a. \(\left\{{}\begin{matrix}\dfrac{1}{2}\left(x+2\right)\left(y+3\right)-\dfrac{1}{2}xy=50\\\dfrac{1}{2}xy-\dfrac{1}{2}\left(x-2\right)\left(y-2\right)=32\end{matrix}\right.\)
b. \(\left\{{}\begin{matrix}\dfrac{3x+5}{x+1}-\dfrac{2}{y+4}=4\\\dfrac{2x}{x+1}-\dfrac{5y+9}{y+4}=9\end{matrix}\right.\)
c. \(\left\{{}\begin{matrix}x^2+y^2-2x-2y-23=0\\x-3y-3=0\end{matrix}\right.\)
d.\(\left\{{}\begin{matrix}\left(x-y\right)^2-3x-3y=4\\2x+y=3\end{matrix}\right.\)
Giải hpt
\(\left\{{}\begin{matrix}x^3+7y=\left(x+y\right)^2+x^2y+7x+4\\3x^2+y^2-8y+4=8x\end{matrix}\right.\)
Giải hệ PT:
a)\(\left\{{}\begin{matrix}2x-y=5\\x+y=4\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}x+y=7\\x-y=3\end{matrix}\right.\)
c) \(\left\{{}\begin{matrix}x-2y=4\\x+y=1\end{matrix}\right.\)
Giải các hệ phương trình sau:a) \(\left\{{}\begin{matrix}\left(2x-y\right)^2-6x+3y=0\\x+2y=0\end{matrix}\right.\);b) \(\left\{{}\begin{matrix}\sqrt{\dfrac{2x-y}{x+y}}+\sqrt{\dfrac{x+y}{2x-y}}=2\\3x+y=14\end{matrix}\right.\)
