Докажите тождество:
б)ab(c-d)-cd(a-b)-ac(b-d)-bd(c-a)=0
г) (a^3b-b^2)(a^2-2b)(a-3b)+3a^2b^2(a^3-2ab-b)+2b^2(a^4-ab+3b^2)=a^3b(a^3-b)
е) (4a^2+4a+1)(4a^2-4a+1)-(8a^2(2a^2-1)=1
з) (a-2)(a+2)(a^2+4)(a^4+16)-a^8=-256
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