1,79; 1,97; 7,19 ; 7,91; 9,17; 9,71

ta co the lap duoc 6 so thap phan va co hai chu so o phan thap phan

Bai giai

ta co so do

chieu rong --

chieu dai ---} 130

tong so phan bang nhau ia

2+3=5

chieu rong la

(130:5)x2=52(m)

chieu dai la

(130:5)x3=78(m)

dap so chieu rong 52m

chieu dai 78m

a) sap xep so thap phan tu lon den be

8,071, 8,01, 7,801,7,18

b) so 7,18 den hang phan muoi ta duoc 7,2

a) 19/7+5/6=149/42

b) 17/6-2=5/6

c) 9x7/10=63/10

d) 11/7: 22/21=3/2

a) 341km2 < 341 000 ha

b) 129 000 mm2 > 12 dm2 9mm2

c) 1/25 ha = 400 m2

a) 4 va 5/6

b) 2 va 3/8