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敷き詰めた火山灰の高さをX(m)とおく
11.64(km^2)=11640000(m^2)
11640000(m^2)・X(m)=10^8(m^3)
(10^8=一億)
X=8.59...(m)
≒8.6(m)
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返信遅れてすみません(>_<)
有難うございます！