упростите выражение:
ПОМОГИТЕ ПОЖАЛУЙСТА!!!!!!!!!!!!!!!!!!!!
а)5(а+2)+(а-2)
2х(х+1)-4х(2-х)
х(х во второй степени + х)-(х во 2-ой степени +х+1)
2у во 2ой степени(6у -1)+3у(у-4у во 2 - ой степени)
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