ajutor repede dau coroană
pls
ajutor repede
am nevoie urgent
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568 - b= 314
b=568-314
b=254
a+143=398
a=398-143
a=255
432+b=678
b=678-432
b=246
243+243= 486
243-243=0
456+b=789
b=789-456
b=333
a-321=321
a=321+321
a=642