question about math（1-3x)(1+3x)-(3x+2)^2,其中x=-1/3,please,thank you very much.2 若3^x=a,3^y=b,则3^2x-y等于——？（用含a,b的代数式表示）

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$question about math（1-3x)(1+3x)-(3x+2)^2,其中x=-1/3,please,thank you very much.2 若3^x=a,3^y=b,则3^2x-y等于——？（用含a,b的代数式表示）$

question about math（1-3x)(1+3x)-(3x+2)^2,其中x=-1/3,please,thank you very much.2 若3^x=a,3^y=b,则3^2x-y等于——？（用含a,b的代数式表示）
question about math
（1-3x)(1+3x)-(3x+2)^2,其中x=-1/3,please,thank you very much.
2 若3^x=a,3^y=b,则3^2x-y等于——？（用含a,b的代数式表示）

question about math（1-3x)(1+3x)-(3x+2)^2,其中x=-1/3,please,thank you very much.2 若3^x=a,3^y=b,则3^2x-y等于——？（用含a,b的代数式表示）
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