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Cristiq
a fost răspuns

a=18+2•{[72-15•(161:7-19)]•2+(31+390:26):23}=

Răspuns :

A=18+2·{[72-15·(23-19)]·2+(31+15):23}
=18+2·{[72-15·4]·2+46:23}
=18+2·[(72-60)·2+2]=
=18+2·(12·2+2)
=18+2·(24+2)
=18+2·26=
18+52=70
A=70
Mihaelap
18 + 2 * {[72 - 15 * (23 - 19)] * 2 + (31 + 15) : 23} =
18 + 2 *{[72 - 15 * 4] * 2 + 46 :23} =
18 + 2 * [(72 -60) * 2 + 2] =
18 + 2 * (12 * 2 + 2) =
18 + 2 * (24 + 2) =
18 + 2 * 26 = 
18 + 52 = 70