Ответ(ы) на вопрос:
Гость№32
(b+c)/c * (b-c)/(b+c) =
= (b+c)(b-c) / c (b+c) = (b-c)/c
(a²-b²)/ab * (a-b)/(a+b) =
= (a-b)(a+b)(a-b) / ab (a+b) =
= (a-b)(a-b) /ab = (a-b)² / ab
(1-n)²/ (2m+2n) * (m+n) / (1-2n+n²)=
= (1-n)² * (m+n) / 2(m+n)(1-n)²=
= 1/2
№33.
(a-b)/(x-y) * (x+y)/ (b-a)=
= - (b-a)(x+y) / (b-a) (x-y)=
= - (x+y) / (x-y)
6/(2x-1) * (1-2x) /3x²=
= (-(2x-1) *6 ) / ((2x-1) * 3x²)=
= -6 / 3x² = -2/x²
(m+1)²/ (m-n)² * (n-m)/ (m+1) =
= - (m+1) / (m-n)
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