Toán Lớp 8: Tính
(4x-2y).(x+1)+(x+1)²+(2x-y)²
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Toán Lớp 8: Tính
(4x-2y).(x+1)+(x+1)²+(2x-y)²
Comments ( 2 )
\left( {4x – 2y} \right)\left( {x + 1} \right) + {\left( {x + 1} \right)^2} + {\left( {2x – y} \right)^2}\\
= 4{x^2} + 4x – 2xy – 2y + {x^2} + 2x + 1 + 4{x^2} – 4xy + {y^2}\\
= 9{x^2} + 6x – 6xy – 2y + 1 + {y^2}
\end{array}\]