若X/3=Y/4=Z/5,求(X+Y)/(X-2Y+3Z)的值
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若X/3=Y/4=Z/5,求(X+Y)/(X-2Y+3Z)的值
若X/3=Y/4=Z/5,求(X+Y)/(X-2Y+3Z)的值
若X/3=Y/4=Z/5,求(X+Y)/(X-2Y+3Z)的值
x/3=y/4=z/5=k
x=3k y=4k z=5k
原式=7k/3k-8k+15k=7/10
用x=3,y=4,z=5直接往里带就行了。
令X/3=Y/4=Z/5=k,所以(X+Y)/(X-2Y+3Z)=(3K+4k)/(3k-8K+15k)=7/10
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