PS:/为分数线1.若x/y=3/4,求(x+y)/y,x/(y-x),(x+y)/(y-x)2.已知x/2=y/3=z/4,求(x+y-2z)/2x-y3.已知k=2a/(b+c)=2b/(a+c)=2c/(a+b),求k的取值4.如图,点C`B在线段上,AD/DB=AC/CB,若AB=6cm,AC=3.6cm,求BD,AD图大概是这样的-----------------
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![PS:/为分数线1.若x/y=3/4,求(x+y)/y,x/(y-x),(x+y)/(y-x)2.已知x/2=y/3=z/4,求(x+y-2z)/2x-y3.已知k=2a/(b+c)=2b/(a+c)=2c/(a+b),求k的取值4.如图,点C`B在线段上,AD/DB=AC/CB,若AB=6cm,AC=3.6cm,求BD,AD图大概是这样的-----------------](/uploads/image/z/5956890-42-0.jpg?t=PS%3A%2F%E4%B8%BA%E5%88%86%E6%95%B0%E7%BA%BF1.%E8%8B%A5x%2Fy%3D3%2F4%2C%E6%B1%82%28x%2By%29%2Fy%2Cx%2F%28y-x%29%2C%28x%2By%29%2F%28y-x%292.%E5%B7%B2%E7%9F%A5x%2F2%3Dy%2F3%3Dz%2F4%2C%E6%B1%82%28x%2By-2z%29%2F2x-y3.%E5%B7%B2%E7%9F%A5k%3D2a%2F%28b%2Bc%29%3D2b%2F%28a%2Bc%29%3D2c%2F%28a%2Bb%29%2C%E6%B1%82k%E7%9A%84%E5%8F%96%E5%80%BC4.%E5%A6%82%E5%9B%BE%2C%E7%82%B9C%60B%E5%9C%A8%E7%BA%BF%E6%AE%B5%E4%B8%8A%2CAD%2FDB%3DAC%2FCB%2C%E8%8B%A5AB%3D6cm%2CAC%3D3.6cm%2C%E6%B1%82BD%2CAD%E5%9B%BE%E5%A4%A7%E6%A6%82%E6%98%AF%E8%BF%99%E6%A0%B7%E7%9A%84-----------------)
PS:/为分数线1.若x/y=3/4,求(x+y)/y,x/(y-x),(x+y)/(y-x)2.已知x/2=y/3=z/4,求(x+y-2z)/2x-y3.已知k=2a/(b+c)=2b/(a+c)=2c/(a+b),求k的取值4.如图,点C`B在线段上,AD/DB=AC/CB,若AB=6cm,AC=3.6cm,求BD,AD图大概是这样的-----------------
PS:/为分数线
1.若x/y=3/4,求(x+y)/y,x/(y-x),(x+y)/(y-x)
2.已知x/2=y/3=z/4,求(x+y-2z)/2x-y
3.已知k=2a/(b+c)=2b/(a+c)=2c/(a+b),求k的取值
4.如图,点C`B在线段上,AD/DB=AC/CB,若AB=6cm,AC=3.6cm,求BD,AD
图大概是这样的
----------------------------------------------
A C B D
晕...
倒塌..图改不了.
A在最左端,C在1/5左右的位置.B大概在1/2,D在最右端
PS:/为分数线1.若x/y=3/4,求(x+y)/y,x/(y-x),(x+y)/(y-x)2.已知x/2=y/3=z/4,求(x+y-2z)/2x-y3.已知k=2a/(b+c)=2b/(a+c)=2c/(a+b),求k的取值4.如图,点C`B在线段上,AD/DB=AC/CB,若AB=6cm,AC=3.6cm,求BD,AD图大概是这样的-----------------
1.
设x=3a,y=4a
(x+y)/y=7a/4a=7/4
x/(y-x)=3a/a=3
(x+y)/(y-x)=7a/a=7
2.
设x/2=y/3=z/4=a
∴x=2a,y=3a,z=4a
(x+y-2z)/2x-y =-1
3.
2a/(b+c)=2b/(a+c)
∴a×a+ac=b×b+bc(式1)
2b/(a+c)=2c/(a+b)
∴b×b+ab=ac+c×c(式2)
(式1)+(式2):a×a-c×c=bc-ab
化简:a+c=-b
∴k=2b/(a+c)=-2
4.
AD/DB=(AB+BD)/BD=(6+BD)/BD=6/BD+1
AC/CB=3.6/(6-3.6)=3/2
∴6/BD+1=3/2
∴BD=12
AD=18