(4m的平方+1)的平方-16m的平方
=(4m²+1+4m)(4m²+1-4m)
=(2m+1)²(2m-1)²
(4m^2+1)^2-(4m)^2
=[(4m^2+1)+4m][(4m^2+1)-4m]
=[(2m)^2+2*2m*1+1^2][(2m)^2-2*2m*1+1^2]
=(2m+1)^2(2m-1)^2
就一平方差=(4m2-4m+1)(4m2+4m+1)
=(2m-1)^2(2m+1)^2
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