题目内容

2
9
+
7
18
+
11
18
+
7
9
1
2
+
1
3
+
1
4
1-
5
6
-
1
6
2.5-0.72÷0.4
4
9
×
4
11
+
5
9
×
4
11
3
4
×[
5
6
÷(
3
4
-
2
3
)].
(1)
2
9
+
7
18
+
11
18
+
7
9

=(
2
9
+
7
9
)+(
7
18
+
11
18
),
=1+1,
=2;

(2)
1
2
+
1
3
+
1
4
=
13
12


(3)1-
5
6
-
1
6

=1-(
5
6
+
1
6
),
=1-1,
=0;

(4)2.5-0.72÷0.4
=2.5-1.8,
=0.7;

(5)
4
9
×
4
11
+
5
9
×
4
11

=(
4
9
+
5
9
)×
4
11

=1×
4
11

=
4
11


(6)
3
4
×[
5
6
÷(
3
4
-
2
3
)]
=
3
4
×[
5
6
÷
1
12
],
=
3
4
×10,
=
15
2
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