问题
填空题
(______)(a+b+c)=a2-(b+c)2,
0.09x2-0.6x+______=(0.3x-______)2
答案
(a-b-c)(a+b+c)=a2-(b+c)2,
0.09x2-0.6x+1,
=(0.3x)2-2×0.3x×1+1,
=(0.3x-1)2.
故答案为:a-b-c;1,1.
(______)(a+b+c)=a2-(b+c)2,
0.09x2-0.6x+______=(0.3x-______)2
(a-b-c)(a+b+c)=a2-(b+c)2,
0.09x2-0.6x+1,
=(0.3x)2-2×0.3x×1+1,
=(0.3x-1)2.
故答案为:a-b-c;1,1.