\({\left( {x + y} \right)^2} - {x^2} - {y^2}\)
A.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = xy\).
B.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = - 2xy\).
C.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = 2xy\).
D.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = -xy\).
A.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = xy\).
B.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = - 2xy\).
C.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = 2xy\).
D.\({\left( {x + y} \right)^2} - {x^2} - {y^2} = -xy\).
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Hóa Học lớp 12
