解
(-3x²y)(-4x²y²-5y³-6x+1)
=(-3x²y)(-4x²y²)+(-3x²y)(-5y³)+(-3x²y)(-6x)-3x²y
=12x^4y³+15x²y^4+18x³y-3x²y
3x²y(-4x²y+2xy²-xy)
=-12x^4y²+6x³y³-3x³y²
最后一道不清楚,后面括号重新打一下
解
(-3x²y)(-4x²y²-5y³-6x+1)
=(-3x²y)(-4x²y²)+(-3x²y)(-5y³)+(-3x²y)(-6x)-3x²y
=12x^4y³+15x²y^4+18x³y-3x²y
3x²y(-4x²y+2xy²-xy)
=-12x^4y²+6x³y³-3x³y²
最后一道不清楚,后面括号重新打一下