Toán Lớp 8: ai làm giúp với ạ !
Câu 2 : x^2 – 4 + xy + 2y
a. ( x + 2 ) ( x – 2 + y )
b. x + 2 . x – 2 + y
c. x + 2
d. x – 2 + y
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Toán Lớp 8: ai làm giúp với ạ !
Câu 2 : x^2 – 4 + xy + 2y
a. ( x + 2 ) ( x – 2 + y )
b. x + 2 . x – 2 + y
c. x + 2
d. x – 2 + y
Comments ( 2 )
.x²-4+xy+2y=(x²-4)+(xy+2y)=(x-2).(x+2)+y(x+2)=(x+2).(x-2+y)
#andy
\[\begin{array}{l}
2){x^2} – 4 + xy + 2y\\
= \left( {{x^2} – 4} \right) + \left( {xy + 2y} \right)\\
= \left( {x – 2} \right)\left( {x + 2} \right) + y\left( {x + 2} \right)\\
= \left( {x + 2} \right)\left( {x – 2 + y} \right)\\
\Rightarrow A
\end{array}\]