Răspunsuri

2014-05-04T15:41:01+03:00
9x⁴y⁴z⁴:(x²y²z⁴)+4x²y²+(-3x²y²z):(3z)
= 9x²y²+4x²y²-x²y² 
=13x²y²-x²y²
=12x²y²