Докажите тождество:
д)c(8c+3a)^2-((8c-a)^2(c+a)+24a^2c)= -a^3
e)(a+b)^3-3ab(a+b)=a^3+b^3
ж)(x-y)^3+3xy(x-y)=x^3-y^3
з)(b-c)^3+(c-a)^3+(a-b)^3=3(a-b)(b-c)(c-a)
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