计算:(3xy)²(x²-y²)-(4x²y²)²÷8y²+9x²y的四次方

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计算:(3xy)²(x²-y²)-(4x²y²)²÷8y²+9x²y的四次方

(3xy)²(x²-y²)-(4x²y²)²÷8y²+9x²y的四次方
=9x²y²(x²-y²)-2x^4y²+9x²y^4
=9x^4y²-9x²y^4-2x^4y²+9x²y^4
=7x^4y²