Question

помогите пожалуйста.​

Answer 1

$-x>z+y\\1)quad x+y<-z\-x-y>z\-x>z+yquad boxed{times}\\2)quad z+x+y<0\-z-x-y>0\-x>z+yquad boxed{times}\\3)quad x+z<-y\-x-z>y\-x>z+yquad boxed{times}\\4)quad x>-z-y\-x<z+yquad boxed{checkmark}$