405-(9х+70): 4=385; 1800: (240: у)-47=253 ! - вопрос №82740784059704385180024047253 от кира650 07.12.2020 22:52

Question

Математика: 405-(9х+70): 4=385; 1800: (240: у)-47=253 !

кира650 · Answer

405 - (9х + 70) : 4 = 385 1800 : (240 : у) - 47 = 253
(9х + 70) : 4 = 405 - 385 1800 : (240 : у) = 253 + 47
(9х + 70) : 4 = 20 1800 : (240 : у) = 300
9х + 70 = 20 * 4 240 : у = 1800 : 300
9х + 70 = 80 240 : у = 6
9х = 80 - 70 у = 240 : 6
9х = 10 у = 40
х = 10/9
х = 1 целая 1/9