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x=2,499
Odp. Waga dużego słonia wynosi 2,499kg.
x = 0,999x + 1,5
x - 0,999x = 1,5
0,001x = 1,5
x = 1,5:0,001 = 1,5*1000=1500
Odp. Słoń wazy 1500kg czyli 1,5tony
x-0.009x=1,5
0,001x=1,5/x1000
x=1500kg