a^+6a+42x-5x^+125x^-20xy+2y^4a^-4a+1-2b^
热心网友
a^+6a+4=a^+6a+9-5=(a+3)^-5=(a+3+√5)(a+3-√5)2x-5x^+1=x^+2x+1-6x^=(x+1)^-6x^=(x+1-x√6)(x+1+x√6)=[(1-√6)x+1][(1+√6)x+1]25x^-20xy+2y^=25x^-20xy+4y^-2y^=(5x-2y)^-2y^=(5x-2y+y√2)(5x-2y-y√2)=[5x-(2-√2)y][5x-(2+√2)y4a^-4a+1-2b^ =(2a-1)^-2b^=(2a-1+b√2)(2a-1-b√2)