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Lavinia11
a fost răspuns

(245:5+5 ori x):9+89 egal 100
Aflati nr necunoscut x

Răspuns :

Dianalorent
(245:5+5 ori  x):9+89=100
(49+5x):9+89=100
(49+5x):9=100-89
(49+5x):9=11
49+5x=11ori9
49+5x=99
5x=99-49
5x=50
x=50:5
x=10