$\underset{MB + }{\rightarrow}$$\underset{MC + }{\rightarrow}$$\underset{MD}{\rightarrow}$$\underset{=4MP}{\rightarrow}$
$\underset{MC+}{\rightarrow}$$\underset{MD+}{\rightarrow}$$\underset{MA}{\rightarrow}$$\underset{=4MQ}{\rightarrow}$
$\underset{MD+}{\rightarrow}\underset{MA+}{\rightarrow}\underset{MB}{\rightarrow}\underset{=4 MS}{\rightarrow}$
$\underset{MA+}{\rightarrow}$$\underset{MB+}{\rightarrow}$$\underset{MC}{\rightarrow}$$\underset{=4MS}{\rightarrow}$
Tìm M sao cho: PA=QB=RC=SD
Bài viết đã được chỉnh sửa nội dung bởi minhdat881439: 12-04-2012 - 19:50