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Jarak=skala×jarak peta
=400.000×2.5 cm
= satu juta cm=sepuluh km
400.000
2.)penyelesaiannya = 3y - 5 < 28
3y < 28 + 5
3y < 33
y < 11
misalkan A
A = {1,3,5,7,9}