Question

calculați exprimând rezultatul ib m : a) 5,63dam+30dm ;b)0,8hm-62,3mm;c)0,25km-1,371hm ;d) 4,5dam -1234mm ; e) 1,26dm+0,0012km ; f) 204,7cm+5601mm​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 5,63 dam + 30 dm =

= 56,3 m + 3 m = 59.3 m

1 dam = 10 m

5,63 dam x 10 = 56,3 m

1 m = 10 dm

30 dm : 10 = 3 m

b)0,8 hm - 62,3 mm =

= 80 m - 0,0623 m = 79,9377 m

1 hm = 10 dam = 100 m

0,8 x 100 = 80 m

1 m = 10 dm = 100 cm = 1000 mm

62,3 mm : 1000 = 0,0623 m

c)0,25 km - 1,371 hm =

=250 m - 137,1 m =112,9 m

1 km = 10 hm = 100 dam = 1000 m

0,25 km x 1000 = 250 m

1 hm = 10 dam = 100 m

1,371 hm x 100 = 137,1 m

d) 4,5 dam - 1234 mm =

= 45 m - 1,234 m = 43,766 m

1 dam = 10 m

4,5 dam x 10 = 45 m

1 m = 10 dm = 100 cm = 1000 mm

1234 mm : 1000 = 1,234 m

e) 1,26 dm + 0,0012 km =

= 0,126 m + 1,2 m = 1,326 m

1 m = 10 dm

1,26 dm : 10 = 0,126 m

1 km = 10 hm = 100 dam = 1000 m

0,0012 km x 1000 = 1,2 m

f) 204,7 cm + 5601 mm​ =

= 2,047 m + 5,601 m = 7,648 m

1 m = 10 dm = 100 cm

204,7 cm : 100 = 2,047 m

1 m = 10 dm = 100 cm = 1000 mm

5601 mm : 1000 = 5,601 m