分解因式 x³-4x²y= x的四次方-5x²+4= 6x²+7x-5 = 5x-5x³=

分解因式 x³-4x²y= x的四次方-5x²+4= 6x²+7x-5 = 5x-5x³=
分解因式 x³-4x²y= x的四次方-5x²+4= 6x²+7x-5 = 5x-5x³=

分解因式 x³-4x²y= x的四次方-5x²+4= 6x²+7x-5 = 5x-5x³=
x³-4x²y＝x²(x-4y)
x的四次方-5x²+4
=(x²-4)(x²-1)
=(x+2)(x-2)(x+1)(x-1)
6x²+7x-5 =(2x-1)(3x+5)
5x-5x³=5x(1-x²)=5(1+x)(1-x)