3x+4y+5z=0 (1)
2x+3y-4z=0 (2)
(1)-(2)
x+y+9z=0 (3)
x+y=-9z
(2)-2*(3)
y-22z=0
y=22z
代入(3)
解得x=-31z
x-y=-53z
(x+y+z)/(x-y+z)
=(-9z+z)/(-53z+z)
=(-8)/(-52)
=2/13
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程
数学人气:900 ℃时间:2019-11-02 19:08:59
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