题目内容

用简便方法计算.
11-
5
12
-
7
12
3
4
+
1
3
)×12
2
9
×
4
13
+
4
13
÷
9
7
(1)11-
5
12
-
7
12

=11-(
5
12
+
7
12
),
=11-1,
=10;

(2)(
3
4
+
1
3
)×12,
=
3
4
×12+
1
3
×12,
=9+4,
=13;

(3)
2
9
×
4
13
+
4
13
÷
9
7

=
2
9
×
4
13
+
4
13
×
7
9

=(
2
9
+
7
9
)×
4
13

=1×
4
13

=
4
13
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