Photos А1 А2 В1 В2

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А1 а2 в1 в2. 1/2+1/2. A3+a2-a1/a2+2a+1. 1+2a-1/a2-2a+1-a/a-1. 1+2 +2 +2 =2-1.
1/2+1/2. A3+a2-a1/a2+2a+1. 1+2a-1/a2-2a+1-a/a-1. 1+2 +2 +2 =2-1.

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