Question

Ex nr.2 Urgent DAU COROANĂ.

Answer 1

Răspuns:

Explicație pas cu pas:

Conform scării lungimilor:

1 km=10 hm=100 dam=1000 m

1 m=10 dm=100 cm=1000 mm

a) 13 dam+170 dm=147 m

130 m+17 m=147 m

9 km+15 m=90150 dm

90000 dm+150 dm=90150 dm

63 hm-1300 cm=6287 m

6300 m-13 m=6287 m

18 dm-5 cm=1750 mm

1800 mm-50 mm=1750 m

b) 13 km+400 dm=1304 dam

1300 dam+4 dam=1304 dam

23 hm-4000 dm=190 dam

230 dam-40 dam=190 dam

63 hm-1300 cm=6287 m

6300 m-13 m=6287 m

18 dm-50 cm=13 dm

18 dm-5 dm=13 dm

c) 570 hm÷3=190 hm

190 hm=19 km

64000 m÷4=16000 m

16000 m=160 hm

16 km×3=48 km

48 km=4800 dam

7 cm×21=147 cm

147 cm=1470 mm

d) 16×15 dam=240 dam

240 dam=2400 m

70 dm÷2=35 dm

35 dm=3500 mm

165000 cm÷3=55000 cm

55000 cm=55 dam

20000 m÷5=4000 m

4000 m=4 km