题目内容
已知x +4y-3z = 0,且4x-5y + 2z = 0,x:y:z 为 ( )
A.1:2:3; | B.1:3:2; | C.2:1:3; | D.3:1:2 |
A
联立得: x+4y-3z=0① 4x-5y+2z=0② ,
①5+②×4得:21x=7z,解得:x="1/3" z,代入①得:y="2/3" z,
则x:y:z="1/3" z:2/3 z:z="1/3" :2/3 :1=1:2:3.
故选A
①5+②×4得:21x=7z,解得:x="1/3" z,代入①得:y="2/3" z,
则x:y:z="1/3" z:2/3 z:z="1/3" :2/3 :1=1:2:3.
故选A
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