Предмет: Математика, автор: Oliga28

Срочно допоможіть розвязати будьласка

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Ответы

Автор ответа: dobra888

Ответ: -12 .

Пошаговое объяснение: - 4( 3,6x- 4 ) - ( 7 - 2,1x ) + 5( 0,3x - 5 ) = - 14,4x + 16 -

- 7 + 2,1x + 1,5x - 25 = ( - 14,4x + 2,1x + 1,5x ) + ( 16 -- 7 - 25 ) = (- 14,4x + 3,6x ) +

+ ( 16 - 32 ) = - 10,8x - 16 ;

якщо х = - 10/27 то - 10,8x - 16 = - 10,8 * ( - 10/27 ) - 16 = 0,4*10 - 16 = 4 - 16 = -12 .

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