6x+2=5
6X=3
x=1/2
////////////
Ответ:
(0;10) (-2;-4) (6;4) (-8;2)
Объяснение:
xy-3x+y-10=0
y(x+1)=3x+10
y=(3x+10)/(x+1)=(3x+3+7)/(x+1)=(3x+3)/(x+1)+7/(x+1)=3+7/(x+1)
3 целое число
x+1 должно быть делителем числа 7
x+1=1; x=0; y=3+7=10
x+1=-1; x=-2; y=3-7=-4
x+1=7; x=6; y=3+1=4
x+1=-7; x=-8; y=3-1=2
ответ: (0;10) (-2;-4) (6;4) (-8;2)
X = 8|Y
(8\Y)^2 + Y^2 = 20
64\Y^2 + Y^2 = 20
64 + Y^4 = 20Y^2
Y^2 = A
64 + A^2 = 20A
A^2 - 20A + 64 = 0
D = 400 - 4*1*64 = 400 - 256 = 144 ; V D = 12
A1 = ( 20 + 12) \ 2 = 32 \ 2 = 16
A2 = 8 \ 2 = 4
Y^2 = A
(Y1) = V 16 = 4
(Y2) = V 4 = 2
///////////////////////////////////////////////////////////
X = 8\Y = > X1 = 8\Y1 = 8\4 = 2
X2 = 8\Y2 = 8\2 = 4
///////////////////////////////////////////////////////////////////
( Х + Y)^2
1) ( 2 + 4)^2 = 36
2) ( 4 + 2)^2 = 36
................................
ОТВЕТ: 36
Y = 5x^2 + 2x - 7, при x = 1
y = 5 * 1^2 + 2 * 1 - 7
y = 0
y = 5x^2 + 2x - 7, при x = 2
y = 5 * 2^2 + 2 * 2 - 7
y = 17