计算: - | - 1 | + 12 ⋅ cos 30 ∘ - - 1 2 - 2 + ( π - 3 . 14 ) .
计算:sin30°++(1﹣π)0+.
计算:
计算:20110﹣3tan30°+(﹣)﹣2﹣|﹣2|
计算 (1) (2)(a+1)2﹣a(a﹣1)