Răspuns:
8)
V= l^3
V= 0,216 dm^3= 0,6 dm
l= 0,6 dm
A= l^2
A= 0,6^2=0,36 dm^2
A= 0,36 dm^2
9)
a) P= 4×l
1,6m =16 dm
16 = 4×l
l=16÷4
l=4dm
V=l^3
V=4^3=64 dm
64dm=6,4 m
b)
0,49 dm^2=49 cm^2
A=l^2=7^2 cm^2
l=7cm
V=l^3
V=7^3=343 cm^3
343 cm^3=3,43 dm^3
10)
5,(3)=53-5 48 16
------- = ------- = --------
9 9 3
P=4×l
16 16 16 1 16 4
--- =4×l= ------ ÷ 4= ------ × --- = ----- = ----
3 3 3 4 12 3
l= 4/3
4 ^3 4 4 4 64
V= l^3= --- = ---- × ---- × ---- = ------ = 2,4
3 3 3 3 27
V= 2,4 dam^3
