【4-a²】【a-2】+【a²+6a+9】【2a+6】+2 ,a=2
=-(a+2)(a-2)(a-2)+(a+3)^2*2(a+3)+2
=-(a+2)(a-2)(a-2)+2(a+3)^3+2
=-(a+2)(a-2)^2+2(a+3)^3+2
a=2
上式=-(2+2)(2-2)^2+2(2+3)^3+2
=2*5^3+2
=250+2
=252