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A +80 dam=4 km A =???

Răspuns :

80 dam=0,8km
a+0,8=4
a=4-0,8
a=3,2km
a+80 dam = 4km          80 dam = 8000 km
a + 8000 km = 4km
a = 8000 - 4
a= 7996
Coronita ??