4x^2-x=0
x(4x-1)=0
x1=0
4x-1=0
4x=1
x=0,25
x2=0.25
A)
x = - (x- 5)
x = x - 5
x = - x + 5 ==> 2x = 5 ==> x = 2,5
x = x - 5 ==> 0x=-5
б)
x = x + 14
x = - x - 14
0x = 14 ==> нет реш
2x = - 14 ==> x = - 7
в)
x - 2 = x - 8
x - 2 = - x + 8
0x = - 6 ==> нет реш
2x = 10 ==> x = 5
г)
x + 3 = x - 7
x + 3 = - x + 7
0x = - 10 ==> нет реш
2x = 4 ==> x = 2
AB=R
R=AO=OD(AO=1/2AD)=>R=1/2*36=18
AB=18