Question

Помогите!!!не понимаю как..

Answer 1

Ответ:

$(x - \frac{x}{w} ) {}^{2} = {x}^{2} - 2x \times \frac{x}{w} + \frac{ {x}^{2} }{{w}^{2} } = {x}^{2} - \frac{2 {x}^{2} }{w} + \frac{x {}^{2} }{ {w}^{2} } = \frac{ {x}^{2} w {}^{2} - {2x}^{2}w + {x}^{2} }{ {w}^{2} } = \frac{ {x}^{2}( {w}^{2} - 2w + 1) }{ {w}^{2} } = \frac{x {}^{2} {(w - 1)}^{2} }{w {}^{2} }$