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[(a x 2 + 3)x4-5]:5=27

Răspuns :

SmartGirl06
[(a×2+3)×4-5]÷5=27
(a×2+3)×4-5=27×5
(2•a+3)×4-5=135
(2•a+3)×4=135-5
(2a+3)×4=130
(2a+3)=130÷4
2a+3=32
2a=32-3
2a=28
a=28÷2
a=14