计算:.
计算:.
计算:sin30°++(1﹣π)0+.
计算:
计算:20110﹣3tan30°+(﹣)﹣2﹣|﹣2|
计算(1)(2)(a+1)2﹣a(a﹣1)
(11·十堰)计算:-2-1+︱-1︱.
(11·丹东)(本题8分)计算:
(本小题满分7分)计算:
计算: 2 - 1 + 9 - 2 cos 60 °
(本小题 7 分)计算:
(本小题8分)先化简再求值其中a=+1