x:y=3:2①y:z=5:4②x+y+z=66③
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x:y=3:2①y:z=5:4②x+y+z=66③
x:y=3:2①
y:z=5:4②
x+y+z=66③
x:y=3:2①y:z=5:4②x+y+z=66③
x:y=3:2=15:10
y:z=5:4=10:8
所以x:y:z=15:10:8
x/15=y/10=z/8
令k=x/15=y/10=z/8
则x=15k,y=10k,z=8k
代入x+y+z=66
15k+10k+8k=66
33k=66
k=2
x=15k=30
y=10k=20
z=8k=16
x=37分之792,在带入求y,z
上解完全正确 果然是兵马大都督 文武全才 O(∩_∩)O~
①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程
①3x-4y+z=14x+5y+2z=172x+2y-z=3② x:y=3:2y:z=5:4x+y+z=66
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
①5x-4y+4z=132x+7y-3z=193x+2y-z=18②y=2x-75x+3y+2z=23x-4z=4
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
解方程组x+y/2=z+x/3=y+z/4①x+y+z=27②
三元一次方程求解:①x+2z=3,2x+y=2,2y+z=7.②x+y+z=2,3x-y-4z=5,2x+3y-2z=0.
①X+Y+Z=111②Y:X=3:2③Y:Z=5:4求x,y,z急~
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1
x+y=5 2x+3y-z=9 x-y+z=4
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
解方程组x:y=3:2①y:z=5:4②x-y-z=66③
三元一次方程 X:Y =3:2 ①y:z =5:4 ②x+y+z=66 ③
x:y=3:2①y:z=5:4②x+y+z=66③
x/2=y/3=z/5 x+3y-z/x-3y+z
x+y/2=z+x/3=y+z/4 x+y+z=27
x+2y=3x+2z=4y+z 求x:y:z