упростите выражения
а) (a + b)3 - (a - b)3;
c) (x + y)3 - 3xy(x + y);
e) (a - b)3 + 3ab(a - b);
b) (3m - n)3 - (n + 3m)3;
d) 3ab(a + b) - (a + b)3;
f) (m - n)3 - (m - n)(m2 +mn + n n2)

please help me.​
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