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А1 2. 2+2=5. 4.2.1, 4.2.2, 4.2.3. 3a\4a2-1-a+1\2a2+a. 2+2*2.
2+2=5. 4.2.1, 4.2.2, 4.2.3. 3a\4a2-1-a+1\2a2+a. 2+2*2.