Toán Lớp 8: x + 1 / x – 1 – x – 1 / x + 1 = 4 / ( x – 1 ) . ( x + 1 )
Tìm x
Không biết sài latex ;))
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Toán Lớp 8: x + 1 / x – 1 – x – 1 / x + 1 = 4 / ( x – 1 ) . ( x + 1 )
Tìm x
Không biết sài latex ;))
Comments ( 2 )
⇔$\frac{(x + 1)^2 }{(x – 1)(x+1)}$ -$\frac{ (x – 1 )^2}{(x + 1)(x-1) }$ =$\frac{4}{( x – 1 )( x + 1 )}$
⇒ (x+1)²-(x-1)²=4
⇔x²+2x+1-x²+2x-1=4
⇔4x=4
⇔x=1(loại)
Vậy x∈ rỗng (ko co kí hiệu rỗng ;-; )