Toán Lớp 7: 3 mũ -2 nhân 3 mũ 4 nhân 3 mũ n = 3 mũ 7
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Toán Lớp 7: 3 mũ -2 nhân 3 mũ 4 nhân 3 mũ n = 3 mũ 7
Comments ( 2 )
$3^{-2}.3^4.3^n=3^7$
$⇒3^{-2+4+n}=3^7$
$⇒3^{2+n}=3^7$
$⇒2+n=7$
$⇒n=5$
Vậy $n=5$