Toán Lớp 7: CM vs n lẻ thì ta có :
a ) C = n ² + 4n + 3 chia hết cho 8
b) D = n³ + 3n ² – n – 3 chia hết cho 48
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Toán Lớp 7: CM vs n lẻ thì ta có :
a ) C = n ² + 4n + 3 chia hết cho 8
b) D = n³ + 3n ² – n – 3 chia hết cho 48
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