Разложите на множители: 1) (х-3у)+х^2-9у^2 2) 9м^2+6mn+n^2-25 3) ab^5-b^5-ab^3+b^3 4)...

$1. (x-3y)+(x^2-9y^2)=(x-3y)+(x-3y)(x+3y)=$ $=(x-3y)(1+x+3y)$

$2. 9m^2+6mn+n^2-25=(3m+n)^2-5^2=$ $(3m+n-5)(3m+n+5)$

$3. ab^5-b^5-ab^3+b^3=b^3(ab^2-b^2-a+1)=b^3(b^2(a-1)-(a-1))=$
$b^3(b^2-1)(a-1)=b^3(b-1)(b+1)(a-1)$

$4. 1-x^2+10xy-25y^2=1-(x-5y)^2=(1-x+5y)(1+x-5y)$

Разложите ** множители: 1) (х-3у)+х^2-9у^2 2) 9м^2+6mn+n^2-25 3) ab^5-b^5-ab^3+b^3 4)...