logA＋logB=logAB
logA-logB=log(A/B)なので
log₁₀5＋log₁₀8-log₁₀4=log₁₀(5×8/4)=log₁₀10
log₁₀10=xならば10^x=10なのでx=1すなわち答えは1だと思います。間違っていたらすいません💦
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ありがとうございます😊