5x+3y+2Z=25 6x+3y+z+25 怎么算出7X+3Y=25的?6x+3y+z=25写错了

2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 x/2=y/3=z/5 x+3y-z/x-3y+z 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 因式分解：25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y) 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. x+y+z=6 x+2y+3z=14 y+1=z 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 ｛ 5x-3y+z=25x+2y-4z=3-5x+y-z=2 4x-y+z=25,6x-z+2y=22,x+3y+z=-2 {4x-y+z=25,6x-z+2y=22,x+3y+z=-2 蟹蟹 x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5 {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? x+y+z=1 4x+5y-z=6 x+2y-z=3 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z