TOLONG DI JAWAB dan PAKAI CARANYA

1.5a+7a-3a= 12a-3a= 9a
2.4x+10y-9x+12xy=(4x-9x)+10y+12xy = -5x+10y+12xy
3.12a²-8b+16a²=(12a²+16a²)-8b =28a²-8b
4.6x³+2y²+y²-5x³=(6x³-5x³)+(2y²+y²)= x³+3y²