По формуле (a-b)^2=a^2-2ab+b^2
(a+b)^2=a^2+2ab+b^2
1. (6a-1/6)^2
2. (-12z-3t)^2
3. (2 1/3a-1 1/14b)^2
4. (-1,2x-4 1/6y)^2
5. (0,9x+1 13/27y)^2
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