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Determina a b c d e. a-309=309 1000=10×10×b c+765=2002 d:7=53 6×e+1=55.

Răspuns :

a-309=309....a=309+309.....a=618

1000=10×10×b....1000=100×b.....b=1000:100
b=10

c+765=2002....c=2002-765....c=1237

d:7=53...d=53×7....d=371

6×e+1=55....6×e=55-1....6×e=54...e=54:6...e=9

Dacă tu crezi că merit, astept coroana!