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Determinati abcd(cu bara deasupra), stiind ca 4×abcd=2×abcd+2112

Răspuns :

abcd = numar
4× abcd = 2×abcd + 2112
4×abcd - 2×abcd = 2112
2×abcd = 2112
abcd = 2112 : 2
abcd = 1056 (numarul)

verificare:
4 × 1056 = 2×1056 + 2112
4224 = 2112+2112
4224 = 4224