Solving the problem of mathematical line segment in seventh grade - Training Enrollment Network

Solving the problem of mathematical line segment in seventh grade

MN=NA+AM

N is the midpoint of BC, that is, BN=NC=NA+AM+MC.

BA=BN+NA

And m is the midpoint of AC AM=MC.

that is

BA=NA+AM+MC+NA=2(NA+AM)

BA=acm

2(NA+AM)=a

Na+am =1/2cm

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