Question

cate timbre au inpreuna Alexandra si Rebeca stiind ca Rebeca are de 2 ori mai multe iar diferenta e de 10 timbre

Answer 1

a ---- Rebeca
b ---- Alexandra

a-b=10

a=2b

2b-b=10
b=10

a=10×2
a=20

Răspuns :
Rebeca ----20 timbre
Alexandra ---- 10 timbre

Proba :
20-10=10
20:2=10

Answer 2

o sa fac prin segmente

A=Alexandra
R=Rebeca

A ____
R ____ ____

R-A=1 segment=10
A=10
R=A×2=10×2=20

raspuns: Rebeca=20 timbre
Alexandra=10 timbre


MULT SUCCES!!!!