问题 解答题
用简便方法计算
①0.58+
5
13
+1.12+
8
13

②11-
4
11
-
7
11
答案

①0.58+

5
13
+1.12+
8
13

=(0.58+1.12)+(

5
13
+
8
13
),

=1.7+1,

=2.7;

②11-

4
11
-
7
11

=11-(

4
11
+
7
11
),

=11-1,

=10.

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