如果X:Y:Z=3:4:5,且2X+3Y-5Z=-14,则X= Y= Z=
1个回答
X=3a,Y=4a,Z=5a
2X+3Y-5Z=6a+12a-25a=-7a=-14
a=2
X=6,Y=8,Z=10
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如果X:Y:Z=3:4:5,且2X+3Y-5Z=-14,则X= Y= Z=
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