题目内容

计算下面各题,能简算的要简算.
2
5
+8×
3
5

69×
5
23

1200-198
7
9
÷
11
5
+
2
9
×
5
11

4
7
×(1÷
3
4
-
1
4
÷1)+
5
6
(1)8×
2
5
+8×
3
5

=(
2
5
+
3
5
)×8,
=1×8,
=8;

(2)69×
5
23
=15;

(3)1200-198,
=1200-(200-2),
=1200-200+2,
=1002;

(4)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=1×
5
11

=
5
11


(5)
4
7
×(1÷
3
4
-
1
4
÷1)+
5
6

=
4
7
×(
4
3
-
1
4
)+
5
6

=
4
7
×
13
12
+
5
6

=
13
21
+
5
6

=
61
42
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