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(.1..+2xy)²=1+.1..+..4xy.
(a+.a..)²=a²+2a+.1..
(.½x..+4)²=..¼x².+4x+.16..
(1+2xy)²=1+4xy+4x²y²
(a+½)²=a²+a+¼
(½x+4)²=¼x²+4x+16
2.)(1+2xy)*=1+4xy+4xy*
3.)
4.)(-0,5x+4)*=0,25x*+4x+16
* pierwiastek kwadratowy:-)