1 .若a,b,c为△ABC的三边长,且a3+2a2b-a2c-2abc= 0,试判断△ABC的形状。
2.已知a2-3a+1=0。
(1)求a+1/a和a2+1/a2的值;
(2)a3与8a-3的值是否相等?为什么?
3.首字母填空Tom spoke to his dog in a low v
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1 .若a,b,c为△ABC的三边长,且a3+2a2b-a2c-2abc= 0,试判断△ABC的形状。
2.已知a2-3a+1=0。
(1)求a+1/a和a2+1/a2的值;
(2)a3与8a-3的值是否相等?为什么?
3.首字母填空Tom spoke to his dog in a low v .
要过程!!!!!!!!!!!!!!!