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8/(x+y)+18/(x-y)=4/3で、両側に3を掛けて 24/(x+y)+54/(x-y)=4 両辺から 24/(x+y)+24/(x-y)=7/3 やる 30/(x-y)=5/3 だからx-y=18 代入 8/(x+y)+18/(x-y)=4/3 x+y=24 x=21,y=3 ありがとう採用^_^
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