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設x:2=y:3=z:4=k 所以 x=2k y=3k z=4k 所以 2k+3k+4k=18 9k=18 k=2 所以 x=4 y=6 z=8 所以2x+3y+4z= =2×4+3×6+4×8 =8+18+32 =58
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