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くくTRWKWKTKKO 【計算】 300X4.2x(一10)100X4.2X(50一 /) から, 7ビ20 1 1 1 1 1 1 1 1 1
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300×4.2×(t-10)=100×4.2×(50-t)
  300×(t-10)=100×(50-t)
   3(t-10)=(50-t)
    3t-30=50-t
      ,4t=80
       t=20

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