数学题XX*YY=ZXXZ中X,Y,Z各是几
已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z
(x-y)(x+y)(xx-yy)=?
向量内积问题为什么a(x,y,z)、b(x',y',z')的内积a·b=(xx',yy',zz')=xx'+yy'+zz
知x/3=y/4=z/5,求(xy+yz+xz)/xx+yy+zz
x+y+z=5,xx+yy+zz=6,求xy-xz-yz的解
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
已知x=1/2 y=1/3 z=1/4 则(xx+yy-zz+2xy)/(xx-yy+zz-2xz) 得多少?
xx-yy-x-y 因式分解
已知x-y=5,y-z=4,求xx+yy+zz-xy-yz-xz的值
若x/3=y/4=z/5,则(xy+yz=xz)/(xx+yy+zz)的值为
已知X+Y+Z=1,且XY+YZ+XZ=0,求XX+YY+ZZ的值?
XX-YY/(X-Y)(X-Y)约分