bantu jawab beserta caranya ya. Terimakasih:)

1a.180-105=75, b. 180-82=98
2a.180-130=50, b.180-74=106, c.180:2=90
3a.abe dg abd, ebc dg cbd, abd dg cbd, abe dg cbe
4a. 180-15=165 yg b,c, sm d nya lupa caranya mf :(