Răspuns :
2,8 dm=? cm
2,8*10 =28 cm
92-28-28=36
36:2=18
18 cm=? dm
18:10=1,8
2,8*10 =28 cm
92-28-28=36
36:2=18
18 cm=? dm
18:10=1,8
92cm = 9,2 dm ;
P=2(L+l)
9,2 dm = 2*(2,8 dm + l)
4,6dm = 2,8dm + l
l = 4,6dm - 2,8dm = 1,8dm
P=2(L+l)
9,2 dm = 2*(2,8 dm + l)
4,6dm = 2,8dm + l
l = 4,6dm - 2,8dm = 1,8dm