Помогите с упражненияем 121 пожалуйста
121. 1) =a² -4a² -b² -3b²+2a -5b+3ab+ab+2ab= = -3a²-4b²+2a-5b+6ab 2) = a²-3a²+2a²+3b²+b²+4b²+2ab-4ab-3ab= = 8b²-5ab 3) = 12.5m²-8m²+10m²-5.5m²+n²+5n²+6g²= =9m²+6n²+6g² 4) = 2x³+x³+y³-y²+0.6xy²-3xy²+2.4xy²= =3x³+y³-y²-2.4xy²+2.4xy²