Уравнения. x²-5x+6=0 x²-7x+10=0 y²+8y+16=0 y²-10y+25=0 - вопрос №28028825607100816010250 от valerea0 21.12.2020 09:21

Question

Математика: Уравнения. x²-5x+6=0 x²-7x+10=0 y²+8y+16=0 y²-10y+25=0

valerea0 · Answer

X^2 - 5X + 6 = 0
D = 25 - 24 = 1 ; √ D = 1
X1 = ( 5 + 1 ) : 2 = 3
X2 = ( 5 - 1 ) : 2 = 2
ответ 3 и 2

X^2 - 7X + 10 = 0
D = 49 - 40 = 9 ; √ D = 3
X1 = ( 7 + 3 ) : 2 = 5
X2 = ( 7 - 3 ) : 2 = 2
ответ 5 и 2

Y^2 + 8Y + 16 = 0
D = 64 - 64 = 0
Y = ( - 8 ) : 2 = ( - 4 )

Y^2 - 10Y + 25 = 0
D = 100 - 100 = 0
Y = 10 : 2 = 5