解方程组xy/(x+y)=6/5① yz/(x+z)=12/7 ② xz/(x+z)=4/3,(7)-(5) x=2不对吧
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![解方程组xy/(x+y)=6/5① yz/(x+z)=12/7 ② xz/(x+z)=4/3,(7)-(5) x=2不对吧](/uploads/image/z/3167787-3-7.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84xy%2F%28x%2By%29%3D6%2F5%E2%91%A0+yz%2F%28x%2Bz%29%3D12%2F7+%E2%91%A1+xz%2F%28x%2Bz%29%3D4%2F3%2C%EF%BC%887%EF%BC%89-%EF%BC%885%EF%BC%89+x%3D2%E4%B8%8D%E5%AF%B9%E5%90%A7)
解方程组xy/(x+y)=6/5① yz/(x+z)=12/7 ② xz/(x+z)=4/3,(7)-(5) x=2不对吧
解方程组xy/(x+y)=6/5① yz/(x+z)=12/7 ② xz/(x+z)=4/3,(7)-(5) x=2不对吧
解方程组xy/(x+y)=6/5① yz/(x+z)=12/7 ② xz/(x+z)=4/3,(7)-(5) x=2不对吧
(7)-(5)得 1/x=13/12-7/12=1/2
x=2