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8 tháng 9 2017

bạn có biết làm ko?

19 tháng 11 2017

ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt

6 tháng 3 2016

Vì M là trung điểm của AC

=>CM=1/2AC

Vì N là trung điểm của BC

=>CN=1/2BC

Ta có:

MN=MC+CN=1/2AC+1/2BC=1/2(AC+BC)=1/2.16=8(cm)

14 tháng 11 2018

MIk cũng ko thể hiểu nổi đề nếu đúng  đoạn là đoạn thẳng à

A___________M_________________________C______________________B

Ta có:

AB=AC+CB=8cm

Mà AC-BC=2cm

=> 2 BC=8cm-2cm=6cm

=> BC=6cm:2=3cm

AC=8cm-3cm=5cm

Vì C là trung điểm của BM

=>CB=CM=1/2 BM

=> BM=3cm.2=6cm

=> AM=8cm-6cm=2cm