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zapisz w jak najprostrtzej postaci
b) (2a-b)² - 2(a-b)(2a+b)
c) 5(s+3t)(3t-2) - (s+2t)²
d) (z+0,3)²+)z+0,2)(0,2-z)
e) 2 ( a+b / 2) ² - 2 (a/2 +b)(b+a/2)


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