Question

几道分解因式的题，最好有过程，谢谢啦~~~

2ax－10ay＋5by－bx
x³－2x＋1
4x四次＋3x²－1

Answer 1

2ax-10ay+5by-bx
＝2a(x-5y)-b(x-5y)
＝（2a-b)(x-5y)

x³－2x＋1
=x^3-x-(x-1)
=x(x^2-1)-(x-1)
=x(x+1)(x-1)-(x-1)
=(x^2+x-1)(x-1)

4X^4+3X^2-1
=(4X^2-1)(X^2+1)
=(2X+1)(2X-1)(X^2+1)