Ответ:
27a - 49b + 2,4 ( 6a - 7b ) - 42a = 27*10 - 49*( - 2) + 2,4( 6 *10 - 7*( - 2 ) = 270 +98 +2,4* 74 = 368 + 177,6 = 545,6
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Ответ:
27a - 49b + 2,4 ( 6a - 7b ) - 42a = 27*10 - 49*( - 2) + 2,4( 6 *10 - 7*( - 2 ) = 270 +98 +2,4* 74 = 368 + 177,6 = 545,6