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Problem #763

Chứng minh đẳng thức vectơ

Added by tanthinh over 2 years ago.

Status: New Start Date: 02-10-2010
Priority: Normal Due date:
Assigned to: - % Done:

0%

Category: -
Target version: -
Votes: 0/0

Description

Giải dùm em bài này:

Cho tứ giác ABCD. Gọi M, N là trung điểm AB, CD. Chứng minh: vt{AC}+vt{BD}=2vt{MN}.