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合ってるかは分からないけど。
1kt=1000000g=1×10の7乗
×6.8=6.8×10^7kg
6.8×10^7×10^3=6.8×10^10g

6.8×10^10÷7.87×10^2=8.64×10^8g

みてゃん

ありがとうございます(´;ω;`)
ほんとに助かりました!

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