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结果:7 5
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log(7)(343)
= log(7)(7 × 49)
= log(7)(7 × 7 × 7)
= log(7)(7 ³)
= 3 log(7)(7)
= 3 × 1
= 3
log(3)(243)
= log(3)(3 × 81)
= log(3)(3 × 9 × 9)
= log(3)(3 × 3 × 3 × 3 × 3)
= log(3)(3 ^ 5)
= 5 log(3)(3)
= 5 × 1
= 5
= log(7)(7 × 49)
= log(7)(7 × 7 × 7)
= log(7)(7 ³)
= 3 log(7)(7)
= 3 × 1
= 3
log(3)(243)
= log(3)(3 × 81)
= log(3)(3 × 9 × 9)
= log(3)(3 × 3 × 3 × 3 × 3)
= log(3)(3 ^ 5)
= 5 log(3)(3)
= 5 × 1
= 5
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