Question

vlad luca si dina au masurat lungimea unei carti si au obtinut 26,8cm 277 mm si 2,72dm transformati in acceasi unitate de masura si stabiliti cine a masurat corect stiind ca lungimea cartii era egala cu 20% din 1,36 m

Answer 1

[tex]\it 26,8cm=2,68dm \ (Vlad) \\ \\ 277mm=2,77dm\ (Luca) \\ \\ 2,72dm\ (Dina) \\ \\ \\ 1,36m=13,6dm [/tex]

$\it 20\%\ din\ 13,6dm = \dfrac{20}{100} \cdot 13,6 dm = 0,2\cdot13,6dm = 2,72\ dm$

Așadar, Dina a măsurat corect.

Answer 2

20%·1,36 m  = 1,36 m/5 = 136 cm/5 = 27,2 cm

277 mm = 27,7 cm

2,72 dm = 27,2 cm

R : Dina a masurat corect