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a) 450 m2 a dm2
450x100=45000 dm2
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b)9000.000mm2 a m2
9000000 : 100^3= 9 m2
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c)390.000cm2 a m2
390000 / 10000=39 m2
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d)6m2 a cm2
6 x 10000= 60.000 cm2
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e)7852m2 a dm2
7852 x 100= 785.200 dm2