2х+5:х^2+х-2:х=3х:х+1
2х-х^2+х-х-3х-х=1+2
2х-3х-х=3
-2х=3
х=3:(-2)
х=-3/2
х=-1,5
ответ:-1,5
не уверен
..............................................................................................................................
2x^2-6x+4<=0 x^2-3x+2<=0 (x-1)(x-2)<=0 x принадлежит [1;2] ..........................................................................................................................................................................................................
1)-23(x²-2xy+y²)=-23(x-y)²
2)-11(x²+2xy+y²)=-11(x+y)²
У'(х) = (х²+3)'sinx + (x²+3)sin'x=2xsinx+cosx(x²+3)