4(2y-x)+25(x-2y)³
=4(2y-x)-25(2y-x)³
=(2y-x)(4-25(2y-x)²)
=(2y-x)(2²-(5(2y-x))²)
=(2y-x)(2²-(10y-5x)²)
=(2y-x)((2+10y-5x)(2-10y+5x))
=(2y-x)(10y-5x+2)(5x-10y+2)
4（2y-x）+25（x-2y）³
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