Вносят Х. Тогда, доход составит 0,06Х. По условию, тот же доход получится, если 4% взять от Х+600. В таком случае 0,06Х=0,04(Х+600), 0,02Х=24, Х=1200. Ответ: 1200 руб.
X⁴ - x² - 6 = 0
Замена: a = x² > 0.
a² - a - 6 = 0
a = -2 или a = 3.
a = -2 не подходит по поставленному ранее условию.
3 = x² ⇒ x = -√3, x = √3.
Ответ: -√3; √3.
=X^2+4x+y^2+12y+40=0
X^2+4x+4+y^2+12y+36=0
(X+2)^2+(y+6)^2=0
X+2=0 y+6=0
X=-2 y=-6
Ответ (-2;-6)
1) My parnts know so much because they have already travelled a lot.
2) We haven't seen George since last year.
3) I haven't seen this film yet.
4)Alice has just met her friend.
6) The kids have just played in the yard
5) I have never spoken to our teacher.
7) We haven't decided to help him yet.
8) I haven't seen my family for a long time.
9) Have you ever ridden the scooter.
10) Sara has never been snorkelling. She is so inactive!