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Spunetimi va rog cum rezolv a+b=25 a=bx4

Răspuns :

A+b=25
A=4b
4b+b=25
5b=25
B=25:5
B=5
A=4x5
A=20
Verificare
20+5=25
25=25
a + b = 25

a = 4 × b

_________

4 × b + b = 25

5 × b = 25

b = 25 : 5

b = 5

a = 4 × 5

a = 20