Question

помогите с упражненияем 121 пожалуйста

Answer 1

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