若x/2=y/4=z/-5,求2x+3y+4z/5x
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若x/2=y/4=z/-5,求2x+3y+4z/5x
若x/2=y/4=z/-5,求2x+3y+4z/5x
若x/2=y/4=z/-5,求2x+3y+4z/5x
3y=12×y/4=12×x/2=6x
4z=-20×z/-5=-20×x/2=-10x
代入就得结果了
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