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I₁+I₂=0.50・・・①
0.50×I₁=2.0×I₂・・・②

①より、I₂=0.50-I₁
これを②に代入して、
 0.50I₁=2.0(0.50-I₁)
 0.50I₁=1.0-2.0I₁
  2.5I₁=1.0
   I₁=0.40

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