а)

[tex]M + 1,1b - 2,47b^{2} + 0, 8b^{3} - 0,53b^{2} - 1,16b^{3} =\\M + 1,1b - 3b^{2} - 0,36b^{3} \\M = +0,36b^{3}[/tex]

б)

[tex]M - \frac{1}{7}b^{2} + \frac{1}{3}b^{4} - \frac{1}{12}b^{3} - b^{4} + 3\frac{1}{6}b^{3} + 1 = \\\\M - \frac{1}{7}b^{2} - \frac{2}{3}b^{4} + \frac{37}{12}b^{3} + 1\\\\M = -\frac{37}{12}b^{3}[/tex]