已知:x:y:z=1:3:7,x-y-z=6,求x,y,z的值2.已知:a/3=b/5=c/7,且3a+2b-4c=9.求:a+b+c的值3.已知:(2y+3x):(5y-2x)=8:3,求x:y的值4.己知1/x:y=1/2,x/y=1/8,求Y的值.5.己知X=a+b/3,y=b+c/3,a/x+c/y=3,求证b是a,c的比例中
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已知:x:y:z=1:3:7,x-y-z=6,求x,y,z的值
2.已知:a/3=b/5=c/7,且3a+2b-4c=9.求:a+b+c的值
3.已知:(2y+3x):(5y-2x)=8:3,求x:y的值
4.己知1/x:y=1/2,x/y=1/8,求Y的值.
5.己知X=a+b/3,y=b+c/3,a/x+c/y=3,求证b是a,c的比例中项
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1) x=-2/3 y=-2 z=-14/3
2) a=-3 b=-5 c=-7 a+b+c=-15
3) x:y=34:25
5) y=4 或 y=-4
1) x=-2/3 y=-2 z=-14/3
2) a=-3 b=-5 c=-7 a+b+c=-15
3) x:y=34:25
5) y=4 或 y=-4
1) x=-2/3 y=-2 z=-14/3
2) a=-3 b=-5 c=-7 a+b+c=-15
3) x:y=34:25
5) y=4 或 y=-4
由(a+b)/c=k,∴a+b=ck(1)(b+c)/a=k,∴b+c=ak(2)(c+a)/b=k,∴c+a=bk(3)(1)+(2)+(3)得: 2(a+b+c)=
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