若x:y:z=1:3:5,求x+3y-z/x-3y+Z的值.
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若x:y:z=1:3:5,求x+3y-z/x-3y+Z的值.
若x:y:z=1:3:5,求x+3y-z/x-3y+Z的值.
若x:y:z=1:3:5,求x+3y-z/x-3y+Z的值.
x:y:z=1:3:5
得 y=3x,z=5x
x+3y-z/x-3y+Z
=(x+9x-5x)/(x-9x+5x)
=5x/(-3x)
=-5/3
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