先化简再求值先化简再求值【4-a²】【a-2】+【a²+6a+9】【2a+6】+2 ,a=2
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![先化简再求值先化简再求值【4-a²】【a-2】+【a²+6a+9】【2a+6】+2 ,a=2](/uploads/image/z/1015678-46-8.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%E3%80%904-a%26%23178%3B%E3%80%91%E3%80%90a-2%E3%80%91%2B%E3%80%90a%26%23178%3B%2B6a%2B9%E3%80%91%E3%80%902a%2B6%E3%80%91%2B2+%2Ca%3D2)
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先化简再求值先化简再求值【4-a²】【a-2】+【a²+6a+9】【2a+6】+2 ,a=2
先化简再求值先化简再求值【4-a²】【a-2】+【a²+6a+9】【2a+6】+2 ,a=2
先化简再求值先化简再求值【4-a²】【a-2】+【a²+6a+9】【2a+6】+2 ,a=2
【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