题目内容

(1)36×(
5
9
+
3
4
-
11
8

(2)[
1
2
-(
3
8
×
11
12
+
3
8
×
1
12
)]÷
3
4

(3)51×
40
50
(用简便方法计算)
(4){1-[
1
5
+
7
10
÷(
1
2
+
3
8
)]}×
1
2

(5)30
1
28
×
28
29
(看能否用简便方法计算
).
(1)36×(
5
9
+
3
4
-
11
8
),
=36×
5
9
+36×
3
4
-36×
11
8

=20+27-49.5,
=-2.5;

(2)[
1
2
-(
3
8
×
11
12
+
3
8
×
1
12
)]÷
3
4

=[
1
2
-
3
8
×
11
12
+
1
12
)],
=[
1
2
-
3
8
],
=
1
8


(3)51×
40
50

=50×
40
50
+1×
40
50

=40+
4
5

=40
4
5


(4){1-[
1
5
+
7
10
÷(
1
2
+
3
8
)]}×
1
2

={1-[
1
5
+
7
10
÷
7
8
]}×
1
2

={1-[
1
5
+
4
5
]}×
1
2

={1-1}×
1
2

=0×
1
2

=0;

(5)30
1
28
×
28
29

=29×
28
29
+1×
28
29
+
1
28
×
28
29

=28+(
28
29
+
1
29
),
=28+1,
=29.
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