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OpenForLife
@OpenForLife
June 2021
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Помогите пожалуйста,155...
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KREC
Система:
x - первое число
y - второе число
y+2 = x
xy=40
Подстановкой (подставим х во второе уравнение):
x=y+2
y^2+2y-40 =0 (1)
(1) y^2+2y-40 = 0
D1 = k^2-ac
D1 = 1+40 = 41
y1 = -1+sqrt(41)
y2 = -1-sqrt(41)
x=y-2
y1 = -1+sqrt (41)
y2 = -1-sqrt (41)
x1 =-3 + sqrt (41)
y1 = -1+sqrt (41)
x2 = -3 - sqrt (41)
y2 = -3 - sqrt (41)
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Answers & Comments
x - первое число
y - второе число
y+2 = x
xy=40
Подстановкой (подставим х во второе уравнение):
x=y+2
y^2+2y-40 =0 (1)
(1) y^2+2y-40 = 0
D1 = k^2-ac
D1 = 1+40 = 41
y1 = -1+sqrt(41)
y2 = -1-sqrt(41)
x=y-2
y1 = -1+sqrt (41)
y2 = -1-sqrt (41)
x1 =-3 + sqrt (41)
y1 = -1+sqrt (41)
x2 = -3 - sqrt (41)
y2 = -3 - sqrt (41)