Х1=0.3 Х2= -5 дискриминант= 8
Как-то так:)
X=12-y
y(12-y)=11
12y-y^2-11=0
D=144-44
D=100 |D=10
x(1)=-12+10/-2=1
x(2)=-12-10/-2=11
y(1)=12-1=11
y(2)=12-11=1
..............................................................
10) 2=80° -> АВС=180°-80°=100°
3=180°-(45°+100°)=35°
3х - у = 3 3х - 2у = 0 у = 3 3х - 3 = 3 3х = 3 + 3 = 6 х = 2 _ 2х + у = 1 5х + 2у = 0 4х + 2у = 2 5х + 2у = 0 х = -2 у = 5 _ 2х - 3у = 1 3х + у = 7 2х - 3у = 1 9х + 3у = 21 11х = 22 х = 2 у = 1 _ х + у = 6 5х - 2у = 9 2х + 2у = 12 5х -...