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a) 245 mm²=0,000245m²
c) 6 dm²=0,06m²
d) 8 km²=8 000 000m²
2.1a*3a
1,5a*2a
0,5a*6a
3.3,5a=350m²
3,5-5 250
1-x
3,5x=5 250
x=1750 zł
:))