1.已知 x-3y+7z=0,x-2y+4z=0.(xyz≠0),求 x:y:z

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/08 06:07:54

1.已知 x-3y+7z=0,x-2y+4z=0.(xyz≠0),求 x:y:z
2.如图所示,在直角△ABC中,AB=AC,AD⊥BC,垂足为D.E、F分别是CD、AD上的点,且CE=AF.如果∠AED=62°,那么∠DBF为

1,x-3y+7z=0
x-2y+4z=0
y-3z=0
y=3z
x-6z+4z=0
x=2z
x:y:z=2z:3z:z=2:3:1
2,AB=AC,∠C=∠BAD=45°,CE=AF
△AEC≌△BFA
∠AFB=∠AEC
180-∠AFB=180-∠AEC
∠BFD=∠AED=62°
∠DBF=90-∠BFD=28°

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