Разложите на множители (854-855)

854
$x^{2} - y^{2} =(x+y)(x-y) \\ y^{2}-x^{2}=(y+x)(y-x) \\ a^{2}-9=(a-3)(a+3) \\ 16-b^{2}=(4+b)(4-b) \\ x^{2}-1=(x-1)(x+1) \\ 1-a^{2}=(1-a)(1+a) \\ a^{2}-0.01=(a+0.1)(a-0.1) \\ \frac{4}{9} -x^{2}=(\frac{2}{3}-x)(\frac{2}{3}+x)$

855
$9 x^{2} -4=(3x+2)(3x-2) \\ 4a^{2}-25=(2a+5)(2a-5) \\ 16-49y^{2}=(4-7y)(4+7y) \\ 9a^{2}-4b^{2}=(3a+2b)(3a-2b) \\ 16m^{2}-9n^{2}=(4m-3n)(4m+3n) \\ 25x^{2}-y^{2}=(5x-y)(5x+y) \\ 4x^{2}-1=(2x-1)(2x+1) \\ 1-36a^{2}=(1-6a)(1+6a)$

Разложите ** множители (854-855)