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a)
V=6cm * 4cm* 12cm= 288cm³
b)3 i 1/2cm * 6 i 2/3cm * 10 i 1/2cm= 7/2cm * 20/3 * 21/2= 7/1cm * 5/1cm * 7/1cm= 245cm³
2.
50cm= 5dm
V= (5dm)³= 125dm³