Mathematics line segment of the first day of junior high school Volume 1 - Training Enrollment Network

Mathematics line segment of the first day of junior high school Volume 1

Remarks: AC= two-thirds AB is wrong, it should be: AB=2/3AC.

M and n divide the line segment AC into three parts: 1:2:3.

Namely: am: Mn: NC = 1: 2: 3.

AM= 1/2MN，NC=3/3MN

AC = AM+MN+NC = 1/2MN+MN+3/2MN = 3MN = 3 * 4 = 12

Similarly: AB=2/3AC

∴AB=2/3* 12=8

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