依次:(x-根5)^2(x-根2)(x+根2)(根3*a+根10)(根3*a-根10)(a+根3)^2*(a-根3)^2(x-根5)^2 指(x-根5)的平方
(1)(x-5½)^2(2)(x-2½)(x+2½)(3)(3½a-10½)(3½a+10½)(4)(a^2-3)^2=(a-3½)^2(a+3½)^2