tolong bantu ya,bsk mau dikumpul

1.-12:3×-5×8
=-4×-5
=20×8
=160
2. 3 2/5=17/5
4 1/3=13/3
=17/5+13/3
=17/15+13/15
=31/15
3. 65°+40°=180°
=105°
=180°-105°=175°
jd besar sudut A adlh 175°
4. 3x+4=2x+9=3x+2x=4-9
=5x=-5
=x=-5/5
x=-1
5. 2x+5°=x+10=180°
=2x+x=180°
=3x=180°
x=180/3
x=60

sudut POR adlh=2x+5°=
=2.60+5
=120+5=125
JD besar sudut POR adlh 125°