因式分解3x4四次方y-9x次方y平方-54x平方y次方

问题描述:

因式分解3x4四次方y-9x次方y平方-54x平方y次方

3x^4y-9x^3y^2-54x^2y^3
=3x²y(x²-3xy-18y²)
=3x²y[(x²-6xy)+(3xy-18y²)]
=3x²y[x(x-6y)+3y(x-6y)]
=3x²y(x-6y)(x+3y).