Расставьте знаки действий "+", "-", "х", ":" и скобки так,чтобы подучилось верное равенство: а) 1 9 9 9 = 0,
б) 1 9 9 9 = 1,
в) 1 9 9 9 = 3,
г) 1 9 9 9 = 9,
д) 1 9 9 9 = 10
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