Có bao nhiêu giá trị x thỏa mãn 5(2x – 5) = x(2x – 5)

A. $3{(x – 3y)}^2$

B. (x – 3y)(3x + 9y)

C. (x – 3y) + (3 – 9y)

D. (x – 3y) + (3x – 9y)

A. 5x(x – y) – (y – x) = (x – y)(5x + 1)

B. 5x(x – y) – (y – x) = 5x(x – y)

C. 5x(x – y) – (y – x) = (x – y)(5x – 1)

D. 5x(x – y) – (y – x) = (x + y)(5x – 1)

A. m(x + y + 1)

B. m(x + y + m)

C. m(x + y)

D. m(x + y – 1)

A. $x=3; x=-\frac{1}{2}$

B. $x=-3; x=-\frac{1}{2}$

C.  $x=3; x=\frac{1}{2}$

D. $x=-3; x=\frac{1}{2}$

A. $4x^3{y}^2 – 8x^2{y}^3 = 4x^{2}y(xy – 2y^2)$

B. $4x^3{y}^2 – 8x^2{y}^3 = 4x^2{y}^2(x – y)$

C. $4x^3{y}^2 – 8x^2{y}^3 = 4x^2{y}^2(x – 2y)$

D. $4x^3{y}^2 – 8x{{}^{2}y}^3 = 4x2y^2(x – 2y)$

A. 1

B. 2

C. 3

D. 0