Вопрос школьника по предмету Алгебра
укажите выражение, тождественно равное дроби х-2/1-х 1) -2-х/x-1 2) 2-x/1-x 3) -2-x/1-x 4)x-2/x-1
Ответ учителя по предмету Алгебра
только первое(1)
(x-2)(x-1)=(-2-x)(1-x)
-2x-2x=-2-2
-4x=-4
x=1
укажите выражение, тождественно равное дроби х-2/1-х 1) -2-х/x-1 2) 2-x/1-x 3) -2-x/1-x 4)x-2/x-1
только первое(1)
(x-2)(x-1)=(-2-x)(1-x)
-2x-2x=-2-2
-4x=-4
x=1
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пожалуйста, кратко но всё важное!