解方程組24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3

解方程組24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3

因為8/(x+y) +18/(x-y) = 4/3,兩邊乘以3得
24/(x+y) +54/(x-y) = 4
兩邊同時減去
24/(x+y) +24/(x-y) = 7/3
得
30/(x-y) = 5/3
所以x-y=18
代入
8/(x+y) +18/(x-y) = 4/3
得x+y = 24
所以x=21, y=3
謝謝採納 ^_^

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