Ответ: 1) 21 ; 2) - 30 ; 3) - 1 11/13 ; 4) 4/15 .
Пошаговое объяснение: 17. Якщо a - b = 6; c = 5 , то
1) a - b + 3c = 6 + 3*5 = 21 ;
2) c( b - a ) = 5*( - 6 ) = - 30 ;
3)[ 4( a - b ) ]/ [ ( c - 3(a - b ) ] =( 4*6) /( 5 - 3 *6 ) = 24 / ( - 13 ) = - 1 11/13 ;
4) 3/c - 2/( a - b ) = 3/5 - 2/6 = 3/5 - 1/3 = ( 9 - 5 )/15 = 4/15 .
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Ответ: 1) 21 ; 2) - 30 ; 3) - 1 11/13 ; 4) 4/15 .
Пошаговое объяснение: 17. Якщо a - b = 6; c = 5 , то
1) a - b + 3c = 6 + 3*5 = 21 ;
2) c( b - a ) = 5*( - 6 ) = - 30 ;
3)[ 4( a - b ) ]/ [ ( c - 3(a - b ) ] =( 4*6) /( 5 - 3 *6 ) = 24 / ( - 13 ) = - 1 11/13 ;
4) 3/c - 2/( a - b ) = 3/5 - 2/6 = 3/5 - 1/3 = ( 9 - 5 )/15 = 4/15 .