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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 10: Giải hệ phương trình $\begin{cases} x^2+y^2+6xy-\frac{1}{(x-y)^2}+\frac{9}{8}=0\\2y-\frac{1}{x-y}+\frac{5}{4}=0\end{cases}$

Toán Lớp 10: Giải hệ phương trình $\begin{cases} x^2+y^2+6xy-\frac{1}{(x-y)^2}+\frac{9}{8}=0\\2y-\frac{1}{x-y}+\frac{5}{4}=0\end{cases}$

Comments ( 1 )

  1. Bạn kham khảo
    {(x^2+y^2+6xy-1/((x-y)^2)+9/8=0),(2y-1/(x-y)+5/4=0):}
    ĐK:x\ney
    {(2(x+y)^2-(y-x)^2-1/((y-x)^2)+9/8=0),((y-x+1/(y-x))+(x+y)+5/4=0):}
    <=>{(2(x+y)^2-(y-x+1/(y-x))^2+25/8=0),((y-x+1/(y-x))+(x+y)+5/4=0):}
    Đặt a=x+y;b=y-x+1/(y-x);|b|>=2 hệ thành:
    {(a+b=-5/4),(2b^2-b^2=-25/8):}
    <=>{(a=5/4),(b=-5/2):}
    <=>[({(y+x=5/4),(y-x=-2):}),({(y+x=5/4),(y-x=-1/2):}):}
    <=>[(x=13/8;y=-3/8),(x=7/8;y=3/8):}
    S={(78;3/8),(13/8;-3/8)}
     

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222-9+11+12:2*14+14 = ? ( )