若 x=y\2=z\3,求2X—3X+4Z \-3x+4y—5z

问题描述:

若 x=y\2=z\3,求2X—3X+4Z \-3x+4y—5z

x=y\2=z\3,
y=2x,z=3x,
2X—3y+4Z \-3x+4y—5z
=(2x-6x+12x)/(13x+8x-15x)
=8x/6x
=4/3