Toán Lớp 8: Chọn câu đúng
1.(x+y) (x-y)=x²-2x
2.(x+y) (x-y)=x²+y²
3.(x+y) (x-y)=x²-y²
4.(x+y) (x-y)=x²+2x
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Toán Lớp 8: Chọn câu đúng
1.(x+y) (x-y)=x²-2x
2.(x+y) (x-y)=x²+y²
3.(x+y) (x-y)=x²-y²
4.(x+y) (x-y)=x²+2x
Comments ( 2 )
\left( {x + y} \right){\rm{ }}\left( {x – y} \right) = x^2 – 2x{\rm{ }}\\
\left( {x + y} \right){\rm{ }}\left( {x – y} \right) = x^2 + y^2{\rm{ }}\\
\left( {x + y} \right){\rm{ }}\left( {x – y} \right) = x^2 – y^2{\rm{ }}\\
\left( {x + y} \right){\rm{ }}\left( {x – y} \right) = x ^2+ 2x
\end{array}\]