Gebeneibogdan810ask
a fost răspuns

65:5+6×2{21-3×[6×7-72:(a+1)]}=31.va rog desfasurata.sa inteleg multumesc​

Răspuns :

Pretty45623ask
72
13+12[21-3x(42-72- ——)]=31
a+1
216
13+12(21-126+ ——)=31
a+1

216
13+12(-105+ ——)=31
a+1

2592
13-1260+ ———=31
a+1
2592
-1247+ —————=31
a+1

2592
31+1247=———
a+1
2592
1278=—————-
a+1

a+1(1278)=2592
1278a+1278=2592
-1278a=-1314 | : -1278
73
a= ——
71


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