Trắc nghiệm Những hằng đẳng thức đáng nhớ có đáp án (Nhận biết) !!

A. (A + B)² = A² + 2AB + B²

B. (A + B)² = A² + AB + B²

C. (A + B)² = A² + B²

D. (A + B)² = A² – 2AB + B²

A. (A – B)(A + B) = A² + 2AB + B²

B. (A + B)(A – B) = A² – B²

C. (A + B)(A – B) = A² – 2AB + B²

D. (A + B)(A – B) = A² + B²

A. (x + y)² = (x + y)(x + y)

B. x² – y² = (x + y)(x – y)

C. (-x – y)² = (-x)² – 2(-x)y + y²

D. (x + y)(x + y) = y² – x²

A. (x + 2y)² = x² + 4xy + 4y²

B. (x – 2y)² = x² – 4xy + 4y²

C. (x – 2y)² = x² – 4y²

D. (x – 2y)(x + 2y) = x² – 4y²

A. (4x – 5y)(4x + 5y) 

B. (4x – 25y)(4x + 25y)

C. (2x – 5y)(2x + 5y)

D. (2x – 5y)²

A. $(\frac{x}{9}-\frac{y}{64})(\frac{x}{9}+\frac{y}{64})$

B. $(\frac{x}{3}-\frac{y}{4})(\frac{x}{3}+\frac{y}{4})$

C. $(\frac{x}{9}-\frac{y}{8})(\frac{x}{9}+\frac{y}{8})$

D. $(\frac{x}{3}-\frac{y}{8})(\frac{x}{3}+\frac{y}{8})$

A. 9x² – 24xy + 16y²

B. 9x² – 12xy + 16y²

C. 9x² – 24xy + 4y²

D. 9x² – 6xy + 16y²

A. $\frac{x^2}{4}-xy+4y^2$

B. $\frac{x^2}{4}-2xy+4y^2$

C. $\frac{x^2}{4}-2xy+2y^2$

D. $\frac{x^2}{2}-2xy+2y^2$

A. $(\frac{1}{4}xy+1{)}^2$

B. $(\frac{1}{2}xy+1{)}^2$

C. $(xy-\frac{1}{2}{)}^2$

D. $(\frac{1}{2}xy-1{)}^2$

A. (5x – 2y)²

B. (2x – 5y)²

C. (25x – 4y)²

D. (5x + 2y)²