Toán Lớp 8: tìm x : x(x-1)-x^2+2x=5. giúp mik với :((
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Toán Lớp 8: tìm x : x(x-1)-x^2+2x=5. giúp mik với :((
Comments ( 2 )
x(x – 1) – {x^2} + 2x = 5\\
\Leftrightarrow {x^2} – x – {x^2} + 2x = 5\\
\Leftrightarrow x = 5
\end{array}\]
=>x(x-1-x+2)=5
=>x(-1+2)=5
=>x.1=5
=>x=5