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Cum se rezolva aceast exercitiu, 8-[6400 :16-(360-a×2)×5]:20=4

Răspuns :

8-[400-(360-a×2)×5]:20=4
[400-(360-a×2)×5]÷20=8-4
=4
400-(360-a×2)×5=4×20
=80
(360-a×2)×5=400-80
=320
360-a×2=320÷5
=64
a×2=360-64
=296
a=296:2
a=148