X+Y+Z=51 4X+8Y+5Z=300 4.5X+9Y+7.5Z=360 求解这个三元一次方程组.
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X+Y+Z=514X+8Y+5Z=3004.5X+9Y+7.5Z=360求解这个三元一次方程组.X+Y+Z=514X+8Y+5Z=3004.5X+9Y+7.5Z=360求解这个三元一次方程组.X+Y+
X+Y+Z=51 4X+8Y+5Z=300 4.5X+9Y+7.5Z=360 求解这个三元一次方程组.
X+Y+Z=51 4X+8Y+5Z=300 4.5X+9Y+7.5Z=360 求解这个三元一次方程组.
X+Y+Z=51 4X+8Y+5Z=300 4.5X+9Y+7.5Z=360 求解这个三元一次方程组.
①*4,得4x+4y+4z=204 ④
①*4.5,得4.5x+4.5y+4.5z=229.5 ⑤
②-④,得4y+z=96 z=96-4y ⑥
③-⑤,得4.5y+3z=130.5 ⑦
⑥代入⑦,得4.5y+288-12y=130.5 7.5y=157.5 y=21
代入⑥,得z=96-84=12
代入①,得x=51-21-12=18
所以x=18,y=21,z=12
x+y+z=51 4x+8y+5z=300 x+y+2z=67
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
(x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z
(x+y-z)(x-y+z)=
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x+y+z=-1 4x-2y+3z=5 y-z=8-2x
x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=?
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
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x+y+z=4,x-y+z=0,x-z=8怎么解?
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解三元一次方程组1、x+y-z=4 2x-y+z=5 x-3y+z=-2 2、y+2z=-2 3x+y-4z=1 2x-y+2z=8 3、x-2y+z=-1 x+y+z=2x+2y+3z=-1
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X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)