x:y:z=4:7:8 x+y+2z=54 请即时演算过程.

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x:y:z=4:7:8x+y+2z=54请即时演算过程.x:y:z=4:7:8x+y+2z=54请即时演算过程.x:y:z=4:7:8x+y+2z=54请即时演算过程.x:y:z=4:7:8则x/4=

x:y:z=4:7:8 x+y+2z=54 请即时演算过程.
x:y:z=4:7:8 x+y+2z=54 请即时演算过程.

x:y:z=4:7:8 x+y+2z=54 请即时演算过程.
x:y:z=4:7:8
则x/4=y/7=z/8
令a=x/4=y/7=z/8
x=4a
y=7a
z=8a
所以4a+7a+2×8a=54
27a=54
a=2
所以
x=4a=8
y=7a=14
z=8a=16

设x＝4A，y＝7A，z＝8A，得4A＋7A＋2＊8A＝54，得27A＝54，A＝2，x＝8，y＝14，z＝16

已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z= (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 三元一次方程组2x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=262x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=26 {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 {x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=? x+y+z=-1 4x-2y+3z=5 y-z=8-2x X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 3x+7y+4z=35,x+5y+2z=40,x+y+z=( ) {x+y+z=1 {x+3y+7z=2 {x+5y+19z=4 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z x+y+z=51 4x+8y+5z=300 x+y+2z=67 若4x=7y+5z,2x+y=z,则x:y:z的值为