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Lời giải chi tiết |
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Nhận thấy * 455 ¯ có chữ số tận cùng là 5 nên * 455 ¯ luôn chia hết cho 5 với <math xmlns='http://www.w3.org/1998/Math/MathML'> <semantics> <mrow> <mo>*</mo><mo>∈</mo><mfenced close="}" open="{"> <mrow> <mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mn>3</mn><mo>,</mo><mn>4</mn><mo>,</mo><mn>5</mn><mo>,</mo><mn>6</mn><mo>,</mo><mn>7</mn><mo>,</mo><mn>8</mn><mo>,</mo><mn>9</mn></mrow> </mfenced></mrow> <annotation encoding='MathType-MTEF'>MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaiOkaiabgI GiopaacmaabaGaaGymaiaacYcacaaIYaGaaiilaiaaiodacaGGSaGa aGinaiaacYcacaaI1aGaaiilaiaaiAdacaGGSaGaaG4naiaacYcaca aI4aGaaiilaiaaiMdaaiaawUhacaGL9baaaaa@468E@ </annotation> </semantics> </math>
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