Hằng đẳng thức số 1,2,3

What is the simplified form of the expression x(xy^2 + y) - y(x^2y + x)?

• 2x^2y^2 + 2xy

• x^2y^2 + xy

• 0

• x^2y^2 - xy

What is the expanded form of (a + b)^2?

• a^2 + b^2

• a^2 - 2ab + b^2

• a^2 + 2ab + b^2

• a^2 + ab + b^2

What is the expanded form of (a - b)^2?

• a^2 + 2ab + b^2

• a^2 - b^2

• a^2 - 2ab + b^2

• a^2 - ab + b^2

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What is the expanded form of (x + 1/2)^2?

• x^2 + x + 1/4

• x^2 + 1/4

• x^2 + 2x + 1/4

• x^2 + x + 1/2

What is the expanded form of (2x + y)^2?

• 2x^2 + 2xy + y^2

• 4x^2 + 4xy + y^2

• 4x^2 + 2xy + y^2

• 2x^2 + 4xy + y^2