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0,32 zł * 4 = 1,28
1m=100 cm
100cm-3,20zł
40cm-x
100x=40×3,20
100x=128 |÷100
x=1,28 zł
40 cm kabla kosztuje 1,28 zł
100cm-3,20zł
10cm-x
10cm=0.32 zł
20cm=0,64 zł
40cm=1,28 zł