题目内容
计算下面各题，能简算的要简算．
n七×（
+
-
）
×
×（55+8）
×
+
÷
（得÷
+
÷得）×
．
n七×（
| 得 |
| 8 |
| 得 |
| 5 |
| 得 |
| 得n |
| 得 |
| 7 |
| 5 |
| 8 |
| 5 |
| 8 |
| 得得 |
| 得十 |
| v |
| 8 |
| 得十 |
| 得得 |
（得÷
| 得 |
| 5 |
| 得 |
| 5 |
| n |
| v |
（1）21×（
+
-
）&nb5p;&nb5p;
=21×
+21×
-21×
=三+1-2
=5；
&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;
（2）
×
×（5少+8）
=
×
×5少+
×
×8
=5+
=5
；
（三）
×
+
÷
&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;
=
×
+
×
=（
+
）×
=1×
=
；
&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;
（1）（1÷
+
÷1）×
=（少+
）×
=少×
+
×
=1+
=1
．
| 1 |
| 8 |
| 1 |
| 少 |
| 1 |
| 12 |
=21×
| 1 |
| 8 |
| 1 |
| 少 |
| 1 |
| 12 |
=三+1-2
=5；
&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;
（2）
| 1 |
| 7 |
| 5 |
| 8 |
=
| 1 |
| 7 |
| 5 |
| 8 |
| 1 |
| 7 |
| 5 |
| 8 |
=5+
| 5 |
| 7 |
=5
| 5 |
| 7 |
（三）
| 5 |
| 8 |
| 11 |
| 10 |
| 三 |
| 8 |
| 10 |
| 11 |
=
| 5 |
| 8 |
| 11 |
| 10 |
| 三 |
| 8 |
| 11 |
| 10 |
=（
| 5 |
| 8 |
| 三 |
| 8 |
| 11 |
| 10 |
=1×
| 11 |
| 10 |
=
| 11 |
| 10 |
&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;&nb5p;
（1）（1÷
| 1 |
| 少 |
| 1 |
| 少 |
| 2 |
| 三 |
=（少+
| 1 |
| 少 |
| 2 |
| 三 |
=少×
| 2 |
| 三 |
| 1 |
| 少 |
| 2 |
| 三 |
=1+
| 1 |
| 9 |
=1
| 1 |
| 9 |
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