x+2y=0 2x-y+3z=-1 4x-y+z=3三元一次方程の解和过程
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x+2y=0 2x-y+3z=-1 4x-y+z=3三元一次方程の解和过程
x+2y=0 2x-y+3z=-1 4x-y+z=3
三元一次方程の解和过程
x+2y=0 2x-y+3z=-1 4x-y+z=3三元一次方程の解和过程
这种三元一次方程组的解法常用高斯消元法,四个题解法都是一样的.现给出第(1)题的过程:
由x+y-z=0可得z=x+y,代入剩余两个方程可得:2x-y+3(x+y)=2,x-4y-2(x+y)+6=0,整理得:5x+2y=2,
x+6y=6(这个式子可以两边同乘5得:5x+30y=30),由5x+2y=2,5x+30y=30两式相减消去5x,可得28y=28,y=1,再由x+6y=6(或5x+2y=2)可得x=0,而z=x+y=1,解完!详细过程就是这样,参照着做就可以了,写了这么多,其他三个方程直接给出答案:(2) x=2,y=0,z=-3; (3)x=3,y=-1,z=-3;
(4)x=5/3,y=5/9,z=-1/3;
3X+Y+Z=0,2X-Y+3Z=1,X+2Y-Z=4
1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38
2x+z=10 x+y-z=4 3x-y-z=0
{2x+y=10 {x-y+z=4 {3x-y-z=0
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
x+2y-z=-5 x+y+2z=-1 3x+4y-2z=-12x+2y-z=3 2x+y+3z=0 4x+z=-4
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
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已知4x-3y-3z=x-3y+z=0(x、y、z不等于0)(1)求x:y:z (2)求2x+3y-4z/z的值
x+2y-z=0 2x-3z=1 3x-y+2z=4x+2y-z=02x-3z=13x-y+2z=4
已知4x-3y+z=0 x+3y-11z=0,求:(1)x::z的值;(2)x:y:2的值;(3)x+3y-z/2x-3y+4z的值
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
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