(h:5-5)x9+186:6=400:10 va rog

Răspuns :

(h:5-5)X9+186:6=400:10
(h:5-5)X9+31=40
(h:5-5)X9=40-31
(h:5-5)X9=9
h:5-5=9:9
h:5-5=1
h:5=1+5
h:5=6
h=6x5
h=30

verificare:
(30:5-5)X9+186:6=400:10
(6-5)X9+31=40
1x9+31=40
9+31=40
40=40