Ответ:
320 - ( b * 4 + 120 )/5 = 240 ; | · 5 ;
1600 - ( 4b + 120 ) = 1200 ;
1480 - 4b = 1200 ;
- 4b = 1200 - 1480 ;
- 4b = - 280 ; b = 70 .
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Ответ:
320 - ( b * 4 + 120 )/5 = 240 ; | · 5 ;
1600 - ( 4b + 120 ) = 1200 ;
1480 - 4b = 1200 ;
- 4b = 1200 - 1480 ;
- 4b = - 280 ; b = 70 .