[tex]\it r)\ \ -2\cdot|13-|-17||-(-16+3)\cdot(-1)=-2\cdot|13-17|-(-13)\cdot(-1)=\\ \\ =-2\cdot|-4|-13=-2\cdot4-13=-8-13=-21[/tex]
[tex]\it s)\ \ |-3\cdot(-4)-15|\cdot(-2)+5=|12-15|\cdot(-2)+5=|-3|\cdot(-2)+5=\\ \\ =3\cdot(-2)+5=-6+5=-1[/tex]
[tex]\it t)\ (5-|-8|)\cdot(-5)-(-7-|-3|)=(5-8)\cdot(-5)-(-7-3)=\\ \\ =-3\cdot(-5)-(-10)=-15+10=-5[/tex]
