Спростіть вираз:
а) (2-x)^2-(2+x)^2+8x
b) (4x^2+y)^2+(4y-x^2)^2-17y^2
c) (1/2y-2x)^2+3(3y+1/3x)^2-4xy
Срочно допоможіть дам 20 балов ​
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