а) 2v+4v/3=260 или 10v=780
б) 2v=4v/3 +60 или 2v=180
в) 2v>120
г) 4v/3<150 или 4v< 450
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а) 2v+4v/3=260 или 10v=780
б) 2v=4v/3 +60 или 2v=180
в) 2v>120
г) 4v/3<150 или 4v< 450