计算: ÷﹙ ﹣ + ﹚.
解法一:原式= ÷ ﹣ ÷ + ÷ = ×3﹣ ×4+ ×12= .
解法二:原式= ÷﹙ ﹣ + ﹚= ÷ = ×6= .
解法三:原式的倒数=﹙ ﹣ + ﹚÷ =﹙ ﹣ + ﹚×24
= ×24﹣ ×24+ ×24=4.所以,原式= .