Разложите на множители: 1) a(a+b+c)+b(a+b+c)+c(a+b+c)-4c^2;
2)1-a(a-b+c)+b(a-b+c)+c(a-b-c);
3)xy(x+y)+yz(y-z)-xz(x+z):
4)a(b^2-c^2)+b(c^2-a^2)+c(a^2-b^2)
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