Ответ:

1)1/4х+105°+1/3 х + 40°=180°

1/4х+1/3х=180°-105°-40°

3/12х+4/12х=35°

х=35°:7/12; х=35°•12/7; х=12•5°; х=60°

2) 360°-(2х-55°)-(1/3х +45°)=360°+55°-45°-2х-1/3х;

2 1/3х=370°; х=370°:7/3; х=370°•3/7; х=130°

3)2х-20°+1/3х+95°=180°; 2 1/3х=105°;

х=105°:7/3; х=105°•3/7; х=45°

4) 360°-(х+45°)-(1/4х-105°); 360°-45°+105°=1 1/4х;

х=420°:5/4; х=420°•4/5; х=336°