Toán Lớp 6: 15^x = 81.15.25^2 trả loiwfgiups mình cho 10đ
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Toán Lớp 6: 15^x = 81.15.25^2 trả loiwfgiups mình cho 10đ
Comments ( 2 )
=>15^x = 3^4 . 15 . (5^2)^2
=>15^x=3^4 . 15 . 5^4
=>15^x=(3^4 . 5^4).15
=>15^x=15^4 . 15
=>15^x=15^5
=>x=5
Vậy x=5