X:Y=2:3=8:12 Y:Z=4:5=12:15 X:Y:Z=8:12:15 设X,Y,Z分别为8K,12K,15K 8K+12K-15K=5 5K=5 K=1 X=8 Y=12 Z=15
已知X:Y=2:3,Y:Z=4:5,X+Y-Z=5,求X,Y,Z.
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