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

giai

nua chu vi manh vuon hinh chu nhat la:

130:2=65(m)

tong so phan bang nhau la:

3+2=5(phan)

gia tri mot phan la:

65:5=13

chieu dai manh vuon hinh chu nhat la:

13*3=39(M)

chieu rong manh vuon hinh chu nhat la:

13*2=26(m)

dap so;39m,26m

a,8,071 ; 8,01 ; 7,801 ; 7,18

b,7,2

a,19/7+5/6= 114/42 + 35/42=149/42

b,17/6-2= 17/6-2/1=17/6-12/6=15/6

c,9*7/10=9/1*7/10=90/10*7/10=97/10

d,11/7:22/21=11/7*21/22=231/154

a,341 km2<341000 ha

b,129000 mm2>12 dm2 9 mm2

c,1/25 ha=400 m2

a,341 km2<341000 ha

b,129000 mm2>12 dm2 9 mm2

c,1/25 ha=400 m2

a,4 5/6

b,2 3/8