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[(a-12):5+7]×2=28

Dau coroana.​


Răspuns :

[(a-12):5+7]*2=28

[(a-12):5+7]=28:2=14

[a-12] :5=14-7

[a-12]:5=7

a-12=35

a=47

Salut,

a numărul necunoscut;

[ ( a - 12 ) ÷ 5 + 7 ] × 2 = 28

a = ( 28 ÷ 2 - 7 ) × 5 + 12

a = ( 14 - 7 ) × 5 + 12

a = 7 × 5 + 12

a = 35 + 12

a = 47