Question

сократить дроби,помогите пожалуйста​

Answer 1

Ответ:

$\frac{2z {}^{2} - 8}{z {}^{2} - 2z} = \frac{2(z - 2)(z + 2) }{z(z - 2)} = \frac{2(z + 2)}{z} = \frac{2z + 4}{z}$

$\frac{ab {}^{2} - ac {}^{2} }{c {}^{2} - bc} = \frac{a(b - c)(b + c)}{c(c - b)} = \frac{a(- (c - b)(b + c))}{c(c - b)} = \frac{a ( - (b + c)}{c} = - \frac{ ab - ac}{c}$

$\frac{x {}^{4} - x {}^{2} y {}^{2} }{ay {}^{2} - axy} = \frac{x {}^{2}(x - y)(x + y) }{ay(y - x)} = \frac{x {}^{2} (- (y - x)(x + y))}{ay(y - x)} = - \frac{x {}^{3} + x {}^{2}y }{ay}$