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4.在平行六面体 ABCD-EFGHGFH中,若 (AG)=x(AB)-2y(BC)+EB3zDH,则x+y+z等于A7/6 B2/3 3/45D 5/6 相关知识点: 试题来源: 解析 4.D[ (AB)=(AG)=(AB)+(AD)+(CG)=(AB)+(BC)+(DH) ,对照已知式子可得x=1,-2y=1,3z=1,1故x=1 y=-1/2 z=1/3 ,从而 x+y+z=5/6. ]...