упростите выражение: 3х(3х-1)-(2-3х)
(2-3х)-в квадрате
3х(3х-1)-(2-3х)2=9х2-3х-(4-12х+9х2)=9х2-3х-4+12х-9х2=9х-4
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3х(3х-1)-(2-3х)2=9х2-3х-(4-12х+9х2)=9х2-3х-4+12х-9х2=9х-4