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Aflati nr. necunoscut:   1.  [(e:8+ 5 609):2-111];10   2.(540:6X9-755):(g-385)=5

Răspuns :

 1.  [(e:8+ 5 609):2-111]=10
(e:8+5609):2=10+111
(e:8+5609)=121x2
e:8+5609=242
Ai gresit vreun semn?


2.(540:6X9-755):(g-385)=5
(90x9):(g-385)=5
810:(g-385)=5
g-385=810:5
g-385=162
g=162+385
g=547