Докажите тождество:
д)(m-n)(m^2-mn+n^2)=m^3-n^3
e)(m+n)(m^2-mn+n^2)=m^3+n^3
ж)(p+1)(p+1)(p+1)=p^3+3p^2+3p+1
з)(q-1)(q-1)(q-1)=q^3-3q^2+3q-1
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