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Afla numerele necunoscute.

a+124×84=230×65

39×280-b=20×80

c-320×60=425×40

57×620-d=40×350


Răspuns :

a+10416=14950=>a=4534
10920-b=1600=>b=9320
c-19200=17000=>c=36200
35340-d=14000=>d=339400