解方程:a=38.857-60x-15y-63z 2800x+70y+70z=1540 70x+4.86y+z=80.1
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解方程:a=38.857-60x-15y-63z 2800x+70y+70z=1540 70x+4.86y+z=80.143 70x+y+28z=62
a,x,y,z,都是未知数,解这个四元一次方程!都应该能解出值来!
a,x,y,z,都是未知数,解这个四元一次方程!都应该能解出值来!
a=-258.22793987049028677150786308973
x=0.17532500770891150169596053037311
y=13.700323774283071230342275670675
z=1.2866759173604687018193031144002
x=0.17532500770891150169596053037311
y=13.700323774283071230342275670675
z=1.2866759173604687018193031144002
(x+y-z)(x-y+z)=
消去法解方程组{X+Y=70{Y+Z=140{X+Z=90求X、Y、Z
X+Y+Z=?
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
解方程 .{x+y-z=11 {y+z-x=5 {z+x-y=1
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程
x*(y-Z)=27,y*(x-Z)=35,Z*(x+y)=28三个方程正整数解
x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y----
已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz