计算，能简算的要简算．﹣+﹣= ﹣（ +）= ﹣（﹣）=﹣（ ﹣ ）= +++= +﹣=
计算下面各题．+﹣+++﹣﹣（+）
﹣=+=﹣=﹣=+=﹣= 1﹣=﹣=﹣=+=
+++．
递等式计算+=+=﹣=﹣= 1﹣=+﹣= 1﹣+．
直接写出得数．===== 1﹣=
﹣
+
﹣
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﹣（ 
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﹣
﹣
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= 1﹣
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