( 0,8 + ( - 1/6 )) + ( 2 1/30 ) = ?
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1) 0,8 + ( - 1/6 ) = 8/10 - 1/6 = 48/60 - 10/60 = 38/60
2) 38/60 + 2 ( 1/30 ) = 38/60 + 2 ( 2/60 ) = 2 ( 40/60 ) = 2 ( 4/6 ) = 2 ( 2/3 )
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ОТВЕТ 2 ( 2/3 )