先化简,再求值: ( a + 2 a 2 − 2 a + 1 − a a 2 − 4 a + 4 ) ÷ a − 4 a ,其中 a = ( π − 3 ) 0 + ( 1 2 ) − 1 .
,4分)(1)计算:;
(1)计算:.
(2011浙江丽水,17,6分)计算:|-1|--(5-π)0+4cos45°.
(2011福建泉州,18,9分)计算:.
计算: