[(-3xy)².x⁴-2x²(3xy²)².y/2]÷(-3x
1个回答
原式=(9x^6y²-9x^4y^5)÷(9x^4y²)
=9x^6y²÷(9x^4y²)-9x^4y^5÷(9x^4y²)
=x²-y³
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