Giải thích các bước giải:
$8,$ `(2/3)^x = (4/9)^4`
`⇒ (2/3)^x = [(2/3)^2]^4`
`⇒ (2/3)^x = (2/3)^8`
`⇒ x = 8`
Vậy `x = 8`
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`9, (3/5)^x = (9/25)^3`
`⇒ (3/5)^x = [(3/5)^2]^3`
`⇒ (3/5)^x = (3/5)^6`
`⇒ x = 6`
Vậy `x = 6`
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`10, (6/7)^x = (216/343)^111`
`⇒ (6/7)^x = [(6/7)^3]^111`
`⇒ (6/7)^x = (6/7)^333`
`⇒ x = 333`
Vậy `x = 333`