3600: (18-х)-120=280 (у: 8+18)*9=540 реши ур.

3600:(18-х)-120=280

3600:(18-х)=280+120

3600:(18-х)=400

18-х=3600:400

18-х=9

-х=9-19

х=9

ОТВЕТ: 9

(у:8+18)*9=540

у:8+18=540:9

у:8+18=60

у:8=60-18

у:8=42

у=42*8

у=336

ОТВЕТ: 336

3600:(18-х)-120 = 280                                         (у:8+18)*9 = 540

3600:(18-х) = 280+120                                         у:8+18 = 540:9

3600:(18-х) = 400                                                у:8+18 = 60

18-х = 3600:400                                                  у:8 = 60-18

18-х = 9                                                              у:8 = 42

х = 18-9                                                               у = 42*8

х = 9                                                                   у = 336