Réponse:

Ex 1 = a: 4×c.

=3.7×4

= 14..8 dm

b: L+l×2

4.9 km = 4 900 m

= 4.5+2.4+ 4 900 × 2

= 9 806 ,9 m

c = c +c+c

= 33mm = 3.3 cm

= 6+5+3.3

= 14.3 cm

après je ne sais pas j'espère que sa ta aidé au moin

Exercice 1:

a. 3.7*4 = 14.8dm

b. 4.5*2+2.4*2 = 22.8m

c. 33mm=3.3m 6+5+3.3 = 14.3cm

d. 4.9+5.5+3.2 = 13.6km

e. 58hm=5.8km 10+5.8= 15.8km

f. 2.4+2+3.3+5.6 =13.3cm

Exercice 2:

a. 3.7*3= 11.1mm

b. 2.3*2+1.7 = 6.3m

c.25*2+17= 67cm