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afla valoarea lui a;400 ÷ {[1140-(5045:a-909)]÷130}÷10=5

Răspuns :

400÷{[1140-(5045÷a-909)]÷130}÷10=5
400÷{[1140-(5045÷a-909)]÷130}=50
[1140-(5045÷a-909)]÷130=8
1140-(5045÷a-909)=1040
5045÷a-909=100
5045÷a=1009
a=5