设x/2=y/3=z/4=t
∴x=2t,y=3t,z=4t
∴xy+2yz-3xz分之2x的平方-y的平方+z的平方
=[2×(2t)²-(3t)²+(4t)²]/(2t×3t+2×3t×4t-3×2t×4t)
=(8t²-9t²+16t²)/(6t²+24t²-24t²)
=5/2
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