如何解3x-y+2z=3,3x-y+2z=3,2x+y-3z=11,x+y+z=12
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 22:03:32
如何解3x-y+2z=3,3x-y+2z=3,2x+y-3z=11,x+y+z=12如何解3x-y+2z=3,3x-y+2z=3,2x+y-3z=11,x+y+z=12如何解3x-y+2z=3,3x-
如何解3x-y+2z=3,3x-y+2z=3,2x+y-3z=11,x+y+z=12
如何解3x-y+2z=3,
3x-y+2z=3,2x+y-3z=11,x+y+z=12
如何解3x-y+2z=3,3x-y+2z=3,2x+y-3z=11,x+y+z=12
由1、2式得
5x-z=14,20x-4z=56
由2、3式得
x-4z=-1
19x=57
x=3,z=1,
y=8
3x-y+2z=3……①
2x+y-3z=11……②
x+y+z=12……③
①+②得
5x-z=14……④
①+③得
4x+3z=15……⑤
3*④+⑤得
x=3
将x=3代入④得
z=1
将x=3、z=1代入③得
y=8
所以x=3 z=1 y=8
把3x-y+2z=3和2x+y-3z=11联立,相加得5x-z=14.再把x+y+2=12和3x-y+2z=3联立,相加得4x+3z=15.再把5x-z=14和4x+3z=15联立,(把5x-z=14乘以3),相加x=57,带去前几个式子,z=1,y=8
如何解3x-y+2z=3,3x-y+2z=3,2x+y-3z=11,x+y+z=12
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
matlab解对数方程组[x,y,z]=solve('0.29744*x/(3+0.1*x+y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)))^2','0.79*x/(3+0.1*y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.1*y+z)))^2','1.25*x/(3+0.1*z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.*1y+z)*(3+z)/
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
x/2=y/3=z/5 x+3y-z/x-3y+z
3x-y+z=4,2z+3y-z=12,x+y+z=6的解
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
若x+y+z=3y=2z,则x/x+y+z=?
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
急 x,y,z均为正整数,x>=y,y>=z,z>=8 x+3y-z=急x,y,z均为正整数,x>=y,y>=z,z>=8x+3y-z=132,请问1.x+y+z有最小值782.x+y+z有最大值1343.洽有一组解(x,y,z)使得x+y+z有最大值4.x+3y有最小值1405.x+2y有最大值130
x+y+z=6 x+2y+3z=14 y+1=z
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
解方程 x+y+z=0 4x+2y+z=3 9x-3y+z=28解方程x+y+z=04x+2y+z=39x-3y+z=28