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d×4+20)÷4=12 sa se afle d

Răspuns :

(dx4+20):4=12
dx4+20=12x4
dx4+20=48
dx4=48-20
dx4=28
d=28:4
d=7
(d×4+20)÷4=12
(d×4+20)=12×4
(d×4+20)=48
d×4=48-20
d×4=28
d=28:4
d=7
Sper ca te-am ajutat!