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)