计算(-3x²y)²·(4xy-3x²y-2x³)

问题描述:

计算(-3x²y)²·(4xy-3x²y-2x³)

元素=9x^4y²·(4xy-3x²y-2x³)
=36x^5y³-27x^6y³-18x^7y²