Помогите решить примеры, пожалуйста :)
а) (-0,5у)*20*(-3х)
б) (-а+ 3в - 1,2)*5
в) -2,1*(х - 2у + 3)
г) 2,3у - 1,7*(у - 2) + 0,3*(4 - 2у)
д) 6а - (5а - (4а - 3))
е) -(4у - 9(2у - 1)) - 14у
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