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真ん中の項
log₁₀x²=2log₁₀x

log₁₀100=log₁₀10²=2

2が約分できるので、log₁₀|x|

右側の項
log₁₀0.1=log₁₀1/10=log₁₀(10)⁻¹
 =-1×log₁₀10
-1と分数の前の-をかけて+になっています

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