Odpowiedź :
[tex](1,5ab - 6a^{2}+0,6b) - (9b - 0,5ab + 2,5a^{2}) = \\\\=1,5ab - 6a^{2}+0,6b - 9b + 0,5ab - 2,5a^{2}=\\\\= -8,5a^{2}+2ab -8,4b[/tex]
[tex](1,5ab - 6a^{2}+0,6b) - (9b - 0,5ab + 2,5a^{2}) = \\\\=1,5ab - 6a^{2}+0,6b - 9b + 0,5ab - 2,5a^{2}=\\\\= -8,5a^{2}+2ab -8,4b[/tex]