Question

Cati l de apa incap untr-un acvariu in forma de paralelipiped dreptunghic ce are urm dimensiuni
a)L=30cm,l=2,5dm,h=40cm
b)L=450mm,l=20mm,h=0,6m
c)L=15dm,l=1,2m,h=38cm
d)L=0,04dam,l=250mm,h=10 cm ?

Unde se afla mai multa benzina in 5 bidoane pline,a cate 7,75 l sau in 6 damigene pline,a cate 6,25 l fiecare .

Answer 1

1 litru= 1dm³
a)L=30cm= 3 dm
l=2,5dm
h=40cm=4dm
V=3x2,5x4=30 dm³=30litri

b)L=450mm =4,5 dm
l=20mm =0,2 dm
h=0,6m=6 dm
V=4,5x0,2x6=5,4 dm³=5,4litri

c)L=15dm
l=1,2m=12 dm
h=38cm=3,8 dm
V=15x12x3,8=684 dm³=684 litri

d)L=0,04dam =4 dm
l=250mm =2,5 dm
h=10 cm =1 dm
V=4x2,5x1=10 dm³=10 litri

2. 5x7,75=38,75  
6x6,25=37,5
in 5 bidoade de 7,75 contin mai multa benzina decat 6 damigene de 6,25 l