题目内容
神机妙算细又巧.(能用简便方法的用简便方法计算) 18÷(
|
(0.75-
| ||||||||||||||||
2-
|
| ||||||||||||||||
|
(
|
(1)18÷(
-
),
=18÷
,
=18×6,
=108;
(2)(0.75-
)×(
+
),
=(
-
)×(
+
),
=
×
,
=
;
(3)2-
÷
+
,
=2-
×
+
,
=2-
+
,
=2-(
-
),
=2-
,
=1
;
(4)
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(5)
÷[(
+
)÷
]
=
÷[
÷
],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(6)(
-
+
)÷
,
=(
-
+
)×48,
=
×48-
×48+
×48,
=32-24+8,
=16.
1 |
2 |
1 |
3 |
=18÷
1 |
6 |
=18×6,
=108;
(2)(0.75-
3 |
16 |
2 |
9 |
1 |
3 |
=(
3 |
4 |
3 |
16 |
2 |
9 |
1 |
3 |
=
9 |
16 |
5 |
9 |
=
5 |
16 |
(3)2-
6 |
13 |
9 |
26 |
2 |
3 |
=2-
6 |
13 |
26 |
9 |
2 |
3 |
=2-
4 |
3 |
2 |
3 |
=2-(
4 |
3 |
2 |
3 |
=2-
2 |
3 |
=1
1 |
3 |
(4)
7 |
10 |
4 |
9 |
4 |
9 |
2 |
10 |
=(
7 |
10 |
2 |
10 |
4 |
9 |
=
9 |
10 |
4 |
9 |
=
2 |
5 |
(5)
3 |
5 |
1 |
5 |
1 |
3 |
2 |
9 |
=
3 |
5 |
8 |
15 |
2 |
9 |
=
3 |
5 |
8 |
15 |
9 |
2 |
=
3 |
5 |
12 |
5 |
=
3 |
5 |
5 |
12 |
=
1 |
4 |
(6)(
2 |
3 |
1 |
2 |
1 |
6 |
1 |
48 |
=(
2 |
3 |
1 |
2 |
1 |
6 |
=
2 |
3 |
1 |
2 |
1 |
6 |
=32-24+8,
=16.
练习册系列答案
相关题目