若X/2=Y/3=Z/-5,求2X+Y+3Z/2X的值!
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若X/2=Y/3=Z/-5,求2X+Y+3Z/2X的值!
若X/2=Y/3=Z/-5,求2X+Y+3Z/2X的值!
若X/2=Y/3=Z/-5,求2X+Y+3Z/2X的值!
设X/2=a,则有X=2a,Y=3a,Z=-5a.
原式=[2*2a+3a+3*(-5a)]/(2*2a)=-8a/4a=-2
楼上式子基本上是对的,就是最后有点误差.
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