Разложите на множители:

1) 35a^2-42ab+10a^2b-12ab^2

2) x^3+x^2y+x^2+xy

3) mn^4-n^4+mn^3-n^3

1) = a * (35a-42b+10ab-12b^2)

a * (7 (5a-6b) + 2b * (5a-6b))

a * (7+2b) * (5a-6b)

2) = x * (x^2+xy+x+y)

x * ((x * (x+y) + x+y)

x * (x+1) * (x+y)

3) = n^3 * (mn-n+m-1)

n^3 * (m * (n+1) - (n+1))

n^3 * (m-1) * (n+1)