因为Y:X=3:2,所以y=3x/2 因为Y:Z=5:4 所以y=5z/4根据y=3x/2 所以5z/4=3x/2化简后5z=6x x=5z/6 把x=5z/6,y=5z/4带入X+Y+Z=1115z/6+5z/4+z=111 10z/12+15z/12+12/12z=1332 z=36 x=30 y=45
①X+Y+Z=111②Y:X=3:2③Y:Z=5:4
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