4a^2x^4y^5-9b^4z^2=?1/3m^2-3n^2=?a^2(a-2b)^2-36=?

问题描述:

4a^2x^4y^5-9b^4z^2=?1/3m^2-3n^2=?a^2(a-2b)^2-36=?

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