13+11+26-х
при х=40, то 13+11+26-40=10.
13+11=24
24+26=50
50-40=40
ответ:10
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13+11+26-х
при х=40, то 13+11+26-40=10.
13+11=24
24+26=50
50-40=40
ответ:10