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12 = 3*4
99 = 3*3*11
NWW = 4*3*3*11 = 396
Więc wspólny mianownik to 396
2)
a) 352 ≈ 0
b) 7 893 ≈ 8 000
c) 21 124 ≈ 21 000
d) 358 921 ≈ 359 000
e) 132 873 ≈ 133 000