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(b×4+20)÷20=54cat este b .va multumesc

Răspuns :

[tex](4b+20):20=54\\ 4b+20=1080\\ 4b=1060\\ b=1060:4\\ b=265\\\\ Proba:(4*265+20):20=54\\ (1060+20):20=54\\ 1080:20=54\\ 54=54[/tex]
(bx4+20):20=54 , bx4+20=54x20, bx4+20=1080 , bx4=1080-20, bx4=1060 , b=1060:4 , b=265