Question

помогите пожалуйста плиссс:<​

Answer 1

$\displaystyle\bf\\1)\\\\0,64-49a^{2} x^{2} =0,8^{2} -(7ax)^{2} =(0,8-7ax)\cdot(0,8+7ax)\\\\2)\\\\1-8c^{3} =1^{3} -(2c)^{3} =(1-2c)\cdot(1+2c+4c^{2} )\\\\3)\\\\5a^{3} -5a^{5} =5a^{3} \cdot(1-a^{2} )=5a^{3} \cdot(1-a)\cdot(1+a)\\\\\\3)\\\\(4p-1)^{2} -81p^{2} =(4p-1)^{2} -(9p)^{2} =\\\\=(4p-1-9p)\cdot(4p-1+9p)=(-5p-1)\cdot(13p-1)=\\\\=-(5p+1)\cdot(13p-1)$