Răspuns :
200-158=42
42*25=1050
1050+450=1500
Dublul este 1500,iar nr 750.
Verificare
1500-450=1050
1050:25=42
42+158=200
42*25=1050
1050+450=1500
Dublul este 1500,iar nr 750.
Verificare
1500-450=1050
1050:25=42
42+158=200
[( a×2)-450]:25+158=200
[( a×2)-450]:25=200-158
[( a×2)-450]:25=42
( a×2)-450=42×25
( a×2)-450=1050
a×2=1050+450
a×2=1500
a=1500:2
a=750
V [(750×2)-450]:25+158=
(1500-450):25+158=
1050:25+158=
42+158=
200
[( a×2)-450]:25=200-158
[( a×2)-450]:25=42
( a×2)-450=42×25
( a×2)-450=1050
a×2=1050+450
a×2=1500
a=1500:2
a=750
V [(750×2)-450]:25+158=
(1500-450):25+158=
1050:25+158=
42+158=
200