5x+8y+10z=120和x+y+z=14的方程怎么解

(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 x+y=8 y+z=12 x+z=10 x+y+z= x+y=8 y+z=12 x+z=10 x+y+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 X+Y+Z=15 X+5Y+10Z=70求X,Y和Z X+Y+Z=15 X+5Y+10Z=70求X,Y和Z 已知方程组3x+5y+3z=0,3x-5y-8z=0,并且z≠0,求x:z和y:z (x+y-z)(x-y+z)= 5x+8y+10z=120和x+y+z=14的方程怎么解 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 若X/10=Y/8=Z/9则X+Y+Z/Y+Z=? X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z X+Y+Z=15 X+5Y+10Z=70,Y.Z的值 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian (x+y+z)÷10=x+1.1 y+x=z-80+y-1 z-y=8x+y+8 x+z÷y=?