x+y+z=15 x+y-z=3 x+x+y=13
【升学】 x+y+z=15 x+y-z=3 x+x+y=13
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[物理]x=4,y=5,z=6.x+y+z=15....(1),x+y-z=3.......(2),2x+y=13......(3).(1)-(2):z=(15-3)/2=6,x+y=15-6=9,把x+y=9代入(3):x=13-9=4,y=9-4=5.
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