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Massa totale della cartella in chilogrammi:
$\small m= 1,5+\dfrac{900+800+1200+825+4×275+398+350+85+136}{1000}$
$\small m= 1,5+\dfrac{3725+1100+969}{1000}$
$\small m= 1,5+\dfrac{5794}{1000}$
$\small m= 1,5+5,794$
$\small m= 7,294\,kg.$