数学题若1/x+2/y+3/z=5,3/x+2/y+1/z=7,求1/x+1/y+1/z=多少
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数学题若1/x+2/y+3/z=5,3/x+2/y+1/z=7,求1/x+1/y+1/z=多少
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![数学题若1/x+2/y+3/z=5,3/x+2/y+1/z=7,求1/x+1/y+1/z=多少](/uploads/image/z/18854372-20-2.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%E8%8B%A51%2Fx%2B2%2Fy%2B3%2Fz%3D5%2C3%2Fx%2B2%2Fy%2B1%2Fz%3D7%2C%E6%B1%821%2Fx%2B1%2Fy%2B1%2Fz%3D%E5%A4%9A%E5%B0%91)
两式相加得:
4/x+4/y+4/z=5+7=12,所以:
1/x+1/y+1/z=12/4=3.
4/x+4/y+4/z=5+7=12,所以:
1/x+1/y+1/z=12/4=3.
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