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51 804-a+12 400-500=2 800
Va rog repede!!


Răspuns :

63.704 - a = 2.800

-a = 2.800 - 63.704

-a = -60.904

a = 60.904 (a = 6,0904 • 10^4)

2800+500-12400=-9100
51804 - -9100=
a=60904