Đáp án:
1. $(x + 1)^2 = x^2 + 2x + 1$
3. $( x + 3)^2 = x^2 + 6x + 9$
4.$(2x + 1)^2 = 4x^2 + 4x + 1$
7.$(4x - 1)^2 = 16x^2 - 8x + 1$
11.$( x - \dfrac{3}{4})^2 = x^2 - x.\dfrac{3}{2} + \dfrac{9}{16}$
14.$(x^2 - xy)^2 = x^4 - 2x^3y + x^2y^2$
15.$(x^2 - y^3z)^2 = x^4 - 2x^2y^3z + y^6z^2$
18.$(\dfrac{5}{2}xz + 2y^2)^2 = \dfrac{25}{4}x^2z^2 + 10y^2xz + 4y^4$
19.$(\dfrac{x^2}{y} + xy)^2 = \dfrac{x^4}{y^2} + 2.x^3 + x^2y^2$
20.$(49x^3 - \dfrac{1}{y})^2 = 2401x^6 - 98\dfrac{x^3}{y} + \dfrac{1}{y^4}$
21.$(\dfrac{xz}{y} -\dfrac{y^2}{z})^2 = \dfrac{x^2z^2}{y^2} - 2xy + \dfrac{y^4}{z^2}$
Giải thích các bước giải:
