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2cm=0.2dm
1.5m=15dm
3*0.2*15=9dm³
0.8*9=7.2kg
V=9dm3
p=m/v\*v
m=p*v
m=0,8kg/dm3*9dm3
m=7,2kg
d = 0,8kg/dm³
m = v * d = 9 * 0,8 = 7,2kg
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