Rozwiąż równianie
a) (6+⅓x)(-⅓x+6)+(⅓x-4)²=4
b) (-4x-3)(4x-3)+8(1-√2x)²=1
c) -9(2-x)²-(1-3x)(3x+1)≤11
d) (¼x+2)²+¼(1-½x)(1+½x)≥0
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