Вероятно y=-12/x
а)3=-12/x
x=-4
б)40=-12/x
x=-12/40
x=-0,3
= -Ctga*(-Sina) = Cosa/Sina*Sina = Cosa
2/19=0,10526315
2/17=0,11764
A)EF(-10,-6),GH(12,12)
b)EG(-18,-4) , (-18)kv. + (-4)kv = 324+16=340, eto numero nado eščo odmocnit.
c)1/2(7-3)=2, 1/2(1-5)=-2
W/2,-2/
1) (х-4)/(х^0,5+2)+2=(х^0,5-2)(х^0,5+2)/((х^0,5+)+2=х^0,5-2+2=х^0,5
2) 1/2х-х*1/2=0
(1-х^2)/2х=0
1-х^2=0
х^2=1
х1=1
х2=-1