Tính (a\2-4)^2 Khai triển các bước sau a) ( a/3 +4y)^2 b) ( 1/x -3y)^2 c) ( x/2 -yz/6 )*(x/2+yz/6) d) (x^2 + 2/5*y) * ( x^2 - 2/5*y)

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