Toán Lớp 7: Cho A = 9^23 + 5. 3^43. Chứng minh rằng A chia hết cho 32
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Toán Lớp 7: Cho A = 9^23 + 5. 3^43. Chứng minh rằng A chia hết cho 32
Comments ( 2 )
$A=(3^2)^{23}+5.3^{43}$
$A=3^{2.23}+5.3^{43}$
$A=3^{46}+5.3^{43}$
$A=3^{43+3}+5.3^{43}$
$A=3^{43}.3^3+5.3^{43}$
$A=3^{43}(3^3+5)$
->3^43. 32vdots32 (đpcm)