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Spunetimi cat fac exercitile:
(142-294:7)×a=800
321:a×9-3=960
a <270:9-(505-477).
Va rog!!


Răspuns :

(142-294:7).a=800
(142-42).a=800
100.a=800
a=800:100
a=8

321:a.9-3=960
a.9-3=960
a.3=960
a=960:3
a=320
 
a<270:9-(505-477)
a<270:9-28
a<30-28
a<2
 
(142-294:7)×a=800
(142-42)×a=800
100×a=800
a=800:100
α=8

321:a×9-3=960
321:a×9=960+3
321:a×9=963
321:a=963:9
321:a=107
a=107×321
α=34.347

a mai mic decât 270:9-(505-477)
a mai mic decât 30-28
a mai mic decât 2
α=1