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
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