Question

помогите пожалуйсто 3 и 4 номер 121

Answer 1

3.
12.5m^2+n^2-8m^2+5n^2+10m^2-5.5m^2+6g^2=
=9m^2+6n^2+6g^2=
=6g^2+9m^2+6n^2
4.
0.6xy^2+2x^3+y^3-3xy^2+x^3+2.4xy^2-y^2=
=3x^3+y^3-y^2