Toán Lớp 8: 1, x^2-2xy+2y-4y
2, 4x^2-y^2+8y-16
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Toán Lớp 8: 1, x^2-2xy+2y-4y
2, 4x^2-y^2+8y-16
Comments ( 2 )
1){x^2} – 2xy + 2x – 4y\\
= x\left( {x – 2y} \right) + 2\left( {x – 2y} \right)\\
= \left( {x – 2y} \right)\left( {x + 2} \right)\\
2)\\
4{x^2} – {y^2} + 8y – 16\\
= 4{x^2} – \left( {{y^2} – 8y + 16} \right)\\
= {\left( {2x} \right)^2} – {\left( {y – 4} \right)^2}\\
= \left( {2x – y + 4} \right)\left( {2x + y – 4} \right)
\end{array}$