Răspuns :
Salut,
[( 2a - 100) ÷ 3 + 100 ] ÷ 2 = 100
2a = (100 × 2 - 100) × 3 + 100
2a = (200 - 100) × 3 + 100
2a = 100 × 3 + 100
2a = 300 + 100
2a = 400
a = 200
[ ( 2 a - 100 ) : 3 + 100 ] : 2 = 100
[ ( 2 a - 100 ) : 3 + 100 ] = 100 × 2
[ ( 2 a - 100 ) : 3 + 100 ] = 200
[ ( 2 a - 100 ) : 3 ] = 200 - 100
[ ( 2 a - 100 ) : 3 ] = 100
2 a - 100 = 100 × 3
2 a - 100 = 300
2 a = 300 + 100
2 a = 400
a = 400 : 2
a = 200
[ ( 2 a - 100 ) : 3 + 100 ] = 100 × 2
[ ( 2 a - 100 ) : 3 + 100 ] = 200
[ ( 2 a - 100 ) : 3 ] = 200 - 100
[ ( 2 a - 100 ) : 3 ] = 100
2 a - 100 = 100 × 3
2 a - 100 = 300
2 a = 300 + 100
2 a = 400
a = 400 : 2
a = 200
