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30枚で2mm
2÷30で
つまり１枚で0.066....mm
よって
50mm=0.066x□
したがって
□=750
別解
2mm→50mm
30枚→□枚
比例の関係から30x25で750枚
1枚の厚さが0.0666666
つまり1/15mm
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えーと
厚さYは
どうなるんでしょう？