1、已知X/2=Y/3=Z/4,(1)求(X-Y+Z)/(X+Y+Z) (2)若2x+3y z=18,求x,y,z
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1、已知X/2=Y/3=Z/4,(1)求(X-Y+Z)/(X+Y+Z) (2)若2x+3y z=18,求x,y,z
2、已知2X=5Y,求X/Y ,(X+Y)/Y ,(X-Y)/Y
3、如图已知AD/BD=AE/EC=3/2,试求(1)AB/BD (2)EC/AC
2、已知2X=5Y,求X/Y ,(X+Y)/Y ,(X-Y)/Y
3、如图已知AD/BD=AE/EC=3/2,试求(1)AB/BD (2)EC/AC
1.
设a=X/2=Y/3=Z/4,则:X=2a;Y=3a;Z=4a代入得:
(1)(X-Y+Z)/(X+Y+Z)=3a/(9a)=1/3
(2)2x+3y-z=9a=18,a=2;故x=4,y=6,z=8
2.2X=5Y.
x/y=5/2=2.5
x=2.5y
(x+y)/y=3.5Y/Y=3.5
(x-y)/y=1.5y/y=1.5
3.没有图.
设a=X/2=Y/3=Z/4,则:X=2a;Y=3a;Z=4a代入得:
(1)(X-Y+Z)/(X+Y+Z)=3a/(9a)=1/3
(2)2x+3y-z=9a=18,a=2;故x=4,y=6,z=8
2.2X=5Y.
x/y=5/2=2.5
x=2.5y
(x+y)/y=3.5Y/Y=3.5
(x-y)/y=1.5y/y=1.5
3.没有图.
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
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