срочна
1) (x-2)(x+3)=0
2) x^4-2x^3-3x^2=0
3) x^5-121x^3=0

1) x-2=0x=2x+3=0x=-32) x^2(x^2-2x-3)=0x=0x^2-2x-3=0D=16x=(2+-4)/2=3; -13) x^3(x^2-121)=0x=0x^2=121x=+-11