Ответы на вопрос:
5х + 3y = 380 ( 380/x ) - ( 380/y ) = 19/6 ••••••••• 5x = 380 - 3y x = 76 - 0,6y •••••••••• ( 380y - 380x ) / xy = 19/6 6( 380y - 380x ) = 19xy 2280y - 2280x = 19xy 120y - 120x = xy 120y - 120( 76 - 0,6y ) = y( 76 - 0,6y ) 120y - 9120 + 72y = 76y - 0,6y^2 192y - 9120 = 76y - 0,6y^2 0,6y^2 + 116y - 9120 = 0 d = 13456 + 21888 = 35344 = 188^2 y1 = ( - 116 + 188 ) : 1,2 = 60 y2 = ( - 116 - 188 ) : 1,2 = - 304 : 1,2 = - 3040/12 = - 760/3 = - 253 1/3 x = 76 - 0,6y x1 = 76 - 36 = 40 x2 = 76 + ( 3/5 )•( 760/3 ) = 76 + ( 760/5 ) = 76 + 152 = 228 ответ ( 40 ; 60 ) ; ( 228 ; - 253 1/3 )
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