Răspuns:
1
a) 380cm
b)53m
c)95hm
d)6,2dm
2)
a) 340m+250m-76m=514m
b) 500m+153m-43m=610m
3)
P=4×l=4×15=60dm
A= l^2=15^2=15×15=225 dm
4)
a) 5 m^2 + 27m^2 - 30m^2 = 2m^2
b) 1300 cm^2 + 25 cm^2 - 7 cm^2 =
1318 cm^2
c) 2500 m^3 - 1600 m^3 + 2 m^3 =
903 m^3
d) 3050 cm^3 + 50 cm^3 - 100 cm^3 =
3000 cm^3
5)
a)
P= 2×l+2×L
92 cm = 2×l+2×28cm
92=2l+56
2l=92-56
2l=36
l=36÷2=18 cm
18 cm = 1,8 dm ( lățimea)
b)
A=L×l=2,8×1,8=5,04 dm^2
6)
V = l^3
0,12m =12cm
V=12^3=12×12×12=1728 cm^3
