5x+1.5y+0.5z=100 x+y+z=100 求 X Y Z
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5x+1.5y+0.5z=100x+y+z=100求XYZ5x+1.5y+0.5z=100x+y+z=100求XYZ5x+1.5y+0.5z=100x+y+z=100求XYZ两式相减得4x+0.5y-
5x+1.5y+0.5z=100 x+y+z=100 求 X Y Z
5x+1.5y+0.5z=100 x+y+z=100 求 X Y Z
5x+1.5y+0.5z=100 x+y+z=100 求 X Y Z
两式相减得 4x+0.5y-0.5z=0 z=8x+y .(1)
把(1)代入x+y+z=100 9x+3y=100.(2)
4x+0.5y-0.5z=0 ..5x+1.5y+0.5z=100 做和 9x+2y=100
可知y=0 x=100/9 z=800/9
x=0,y=z=50
化简5x+1.5y+0.5z=100 10*x+3*y+z=200 联合x+y+z=100 9*x+2*y=100 这样的解有无穷个!
5x+1.5y+0.5z=100 x+y+z=100 求 X Y Z
6x+5y+3z=100 x+y+z=30 求 x y
f(x,y,z)=(x^2+y^2)^0.5+z^1.5,求 ∂f(x,y,z)/∂y
解方程组:X+Y+Z=100,10X+5Y+0.5Z=100
0.5x+3y+5z=100 x+y+z=100
(x+y-z)(x-y+z)=
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
紧急..x+y+z=20x+2y+1.5z=367x+10y+6z=100
14x+4y+z=200,x+y+z=100求解x,y,z
{x+y-z=11 y+z-x=5 z+x-y=1
{x+y-z=11,x-y-z=-5,x-y+z=1
x/2=y/3=z/5 x+3y-z/x-3y+z
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
X+Y-Z=15 X+5Y+10Z=70 求:X、Y、Z
请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=23x-2y=12y+3z=2x+5z=315x-3y+2z=13x+4y-z=-18z=136x-y-z=32x-4y+8z=53x-6y-z=10x+y=3y+z=5x+z=6
方程组 {5x+8y+12z=100 x+y+z=14 方程组{5x+8y+12z=100x+y+z=14
X+Y+Z=?