[tex]\displaystyle\bf\\1)\\\\mx^{4} -px^{7} =mx^{4} -px^{4} \cdot x^{3} =x^{4} \cdot(m-px^{3} )\\\\2)\\\\3p^{3} +12p^{8} =3p^{3} +3p^{3} \cdot 4p^{5} =3p^{3} \cdot(1+4p^{5})\\\\3)\\\\15a^{2} -20am=5a\cdot 3a-5a\cdot 4m=5a\cdot(3a-4m)\\\\4)\\\\16xy^{2} -4x^{2} y^{2} +8xy^{3} =4xy^{2} \cdot 4-4xy^{2} \cdot x+4xy^{2} \cdot 2y=\\\\=4xy^{2} \cdot(4-x+2y)[/tex]
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[tex]\displaystyle\bf\\1)\\\\mx^{4} -px^{7} =mx^{4} -px^{4} \cdot x^{3} =x^{4} \cdot(m-px^{3} )\\\\2)\\\\3p^{3} +12p^{8} =3p^{3} +3p^{3} \cdot 4p^{5} =3p^{3} \cdot(1+4p^{5})\\\\3)\\\\15a^{2} -20am=5a\cdot 3a-5a\cdot 4m=5a\cdot(3a-4m)\\\\4)\\\\16xy^{2} -4x^{2} y^{2} +8xy^{3} =4xy^{2} \cdot 4-4xy^{2} \cdot x+4xy^{2} \cdot 2y=\\\\=4xy^{2} \cdot(4-x+2y)[/tex]