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1/4 + x²
4a²+4b²
4+25
4a²-2
a²-9b²
Mam nadzieję ze pomogłam :)
b) (-2a+2b)²=4a²-8ab+4b²
c) (2-5x)²=4-20x+25x²
d) (-2a-1)²=4a²+4a+1
e) (a-3b)(3b+a)=a²-9b²
f) (⅔x-¾y)(⅔x+0,75y) =⁴/₉x²-⁹/₁₆y²