请问大家这道题怎么做
2016-07-06
展开全部
设A原有x元,B原有y元,C原有z元,则
(x-y)+(2y-x+y)+(4z-(x-y)-(2y-x+y))=120=4z 得z=30
(2y-(x-y)-2z)x2=120=6y-2x-4z
4z-2(x-y)-(2y-x+y-2z)=120=4z-2x+2y-2y+x-y+2z=6z-x-y
将z=30代入,则
6y-2x=240 x+y=60
6y-2(60-y)=8y-120=240
y=45
x=15
(x-y)+(2y-x+y)+(4z-(x-y)-(2y-x+y))=120=4z 得z=30
(2y-(x-y)-2z)x2=120=6y-2x-4z
4z-2(x-y)-(2y-x+y-2z)=120=4z-2x+2y-2y+x-y+2z=6z-x-y
将z=30代入,则
6y-2x=240 x+y=60
6y-2(60-y)=8y-120=240
y=45
x=15
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