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[" In the expension of "(x^(2)-(1)/(3x))...

[" In the expension of "(x^(2)-(1)/(3x))^(4)" ,the term without "x" is equal "],[[" to "," as "+a_(2)+a," (a) "(1)/(2)(3^(@)]],[" (a) "(28)/(81)," (b) "(-28)/(243)," " "]

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