[tex]\displaystyle\bf\\a^{4}-0,6a^{5} +*=(a^{2})^{2} -2\cdot a^{2}\cdot 0,3a^{3} +(0,3a^{3})^{2}=\\\\\\= a^{4}-0,6a^{5} + \boxed{0,09a^{6} }=(a^{2} -0,3a^{3})^{2} \\\\\\Otvet \ : \ *=0,09a^{6}[/tex]
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[tex]\displaystyle\bf\\a^{4}-0,6a^{5} +*=(a^{2})^{2} -2\cdot a^{2}\cdot 0,3a^{3} +(0,3a^{3})^{2}=\\\\\\= a^{4}-0,6a^{5} + \boxed{0,09a^{6} }=(a^{2} -0,3a^{3})^{2} \\\\\\Otvet \ : \ *=0,09a^{6}[/tex]