tolong di jawab ya pakai cara

1)
2x²+3y-2x²+4y+5x²y
= (2-2)x²+5x²y+(3+4)y
= 5x²y+7y

2)
x+3y+4+3x-5
= (1+3)x+3y+4-5
= 4x+3y-1

3)
urutan dr trbesar ke trkecil :
25°,20°,15°,-30°,-25°,-23