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(3x-6y) totul la a 3-a...Urgennnnttt


Răspuns :

DaDa(3x-6y)^3=
=27x^3-162x^2 y+324xy^2-(6y)^3=
=27x^3-162x^2 y+324xy^2-216y^3
[3(x-2y)]³=27(x³-3x²·2y+3·x·4y²-8y³)=
=27(x³-6x²y+12xy²-8y³)=
=27x³-162x²y+324xy²-216y³