Х²+2х-48=0
х²+6х-8х-48=0
(х²+6х)+(-8х-48)=0
х(х+6)-8(х+6)=0
(х+6)(х-8)=0
1)х+6=0 2)х-8=0
х=-6 х=8
(7*2*sin 77* cos 77)
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻=14cos77/sin13=14cos(90-13)/sin13=14sin13/sin13=14
sin 77*sin13
N-1;n;n+1
(n-1)^2+n^2+(n+1)^2=
n^2-2n+1+n^2+n^2+2n+1=3n^2+2=1202
3n^2=1200
n^2=400
n=20
числа 19;20;21
n=-20
числа -21;-20;-19