Question

Trei numere consecutive au suma 30.Care sunt nr?

Answer 1

∅ Rezolvare :
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→ Primul mod :
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a | ----- |

b | ----- | ¹

c | ----- | ¹ ¹


30 – ( 1 • 3 ) = 30 – 3 = 27 ( trei părți egale cu numărul mic )
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27 : 3 = 9 ( a )
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9 + 1 = 10 ( b )
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9 + 1 + 1 = 10 + 1 = 11 ( c )
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→ Al doilea mod :
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x + x + 1 + x + 2 = 30 →
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3x + 3 = 30 →
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3x = 30 – 3 →
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3x = 27 →
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x = 27 : 3 →
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x = 9
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x + 1 = 9 + 1 = 10
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x + 2 = 9 + 2 = 11
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