等号的左右两边相加,左边等于3z,右边xyw都抵消了等于6,所以z等于2.
已敏中饥锋知z=x-y+4 z=y-w-3 z=w-x+5所桥肢山以3Z=(X-Y+4)+(y-w-3)+(w-x+5) 3Z=X-Y+4+Y-W-3+W-X+5 3Z=6 Z=2