1)2t^3+1/4 =2(t³+1/8)=2(t+1/2)(t²-t/2+1/4)(2)a^4-6a^2-27 =(a²-9)(a²+3)=(a+3)(a-3)(a²+3)约分:10a^3*b*c/5a^2*b^3*c^2=2a/b²c²
(1)2(t+1/2)(t^2+t/2+1/4)(2)(a^2+3)(a+3)(a-3)2a/b^2*c
(1)2(t+1/2)(t^2-1/2t+1/4)(2)(a^2+3)(a+3)(a-3)(3)2a/(b^2c)